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  • E-mailEinar.Thomassen@uib.no
  • Phone+47 55 58 24 50+47 416 03 069
  • Visitor Address
    AHKR, Øysteins gate 3
    Bergen
  • Postal Address
    Postboks 7805
    5020 Bergen
  • Formative Christianity
  • Gnosticism
  • Religions of Antiquity
  • Formative Islam
  • Comparative History of Religions

My main area of research over the years has been Valentinianism, the most important variety of Christian ‘Gnosticism’ in Antiquity. I regard it as a distinct branch of Christianity, founded by Valentinus c. 150 CE and still alive at the end of the fourth century. The Valentinians were condemned as heretics by the theologians of mainstream Christianity.

I have worked extensively on the Coptic manuscripts from Nag Hammadi, which among other things contain several important Valentinian texts, and I am co-editor of the book series Nag Hammadi and Manichaean Studies.

Greco-Roman religion and the history of early Christianity are general research interests that cohere naturally with my specialised research.

Another research interest is Islam, where I have previously worked, among other things, on Sufism. I currently take a special interest in the origins of the Qur’an and its Late Antique context.

Finally I have always taken an interest in comparative issues in the study of religion, both thematic and historical. In this area I am now looking at macro-historical processes in the light of cognitive psychology and the general theory of evolution.

 

Books
  • Thomassen, Einar. 2011. Manikeiske skrifter. Utvalg og innledende essay av Einar Thomassen; oversatt av Prods Oktor Skjærvø og Einar Thomassen. 348 pages. ISBN: 978-82-525-7263-6.
  • Gilhus, Ingvild Sælid; Thomassen, Einar. 2010. Oldtidens religioner. Midtøstens og Middelhavsområdets religioner. Pax Forlag. 259 pages. ISBN: 978-82-530-3252-8.
  • Thomassen, Einar. 2010. Canon and Canonicity: The Formation and Use of Scripture. Museum Tusculanums Forlag. 232 pages. ISBN: 978-87-635-3027-9.
  • Thomassen, Einar; Painchaud, Louis; Funk, Wolf-Peter. 2010. L’Interprétation de la gnose (NH XI,1). Peeters Publishers. 183 pages. ISBN: 978-90-429-2190-0.
  • Klostergaard Petersen, Anders; Hyldahl, Jesper; Thomassen, Einar. 2008. Mellem venner og fjender : en folkebog om Judasevangeliet, tidlig kristendom og gnosis. Forlaget ANIS. 334 pages. ISBN: 978-87-7457-455-2.
  • Thomassen, Einar; Rasmussen, Tarald. 2007. Kristendomen : en historisk introduktion. 416 pages. ISBN: 978-91-7580-336-4.
  • Thomassen, Einar. 2006. The spiritual seed : the church of the "Valentinians". Brill Academic Publishers. 560 pages. ISBN: 90-04-14802-7.
  • Thomassen, Einar. 2003. Mircea Eliade: Det hellige og det profane, og andre skrifter. 376 pages. ISBN: 82-525-3733-2.
  • Thomassen, Einar; Gilhus, Anne Ingvild S. 2002. Gnostiske skrifter. 313 pages. ISBN: 82-525-4108-9.
  • Thomassen, Einar; Rasmussen, Tarald. 2002. Kristendommen: En historisk innføring. Universitetsforlaget. 392 pages. ISBN: 82-15-00292-7.
  • Thomassen, Einar; Moxnes, Halvor. 2001. Apokryfe evangelier. 271 pages. ISBN: 82-525-4105-4.
  • Thomassen, Einar; Rasmussen, Tarald. 2000. Kristendommen: En historisk innføring. Universitetsforlaget. 392 pages. ISBN: 82-00-12900-4.
  • Jordan, David R.; Montgomery, Hugo; Thomassen, Einar. 1999. The world of ancient magic: Papers from the first International Samson Eitrem Seminar at the Norwegian Institute at Athens 4-8 May 1997. (Papers from the Norwegian Institute at Athens 4). ISBN: 82-91626-15-4.
  • Rasmussen, Tarald; Thomassen, Einar. 1999. Kildesamling til Kristendomskunnskap med religions- og livssynsorientering; Tilleggshefte. ISBN: 82-486-0040-8.
  • Thomassen, Einar; Rasmussen, Tarald. 1999. Kildesamling til Kristendomskunnskap med religions- og livssynsorientering. 583 pages. ISBN: 82-486-0039-4.
  • Thomassen, Einar; Rasmussen, Tarald. 1999. Kildesamling til kristendomskunnskap med religions- og livssynsorientering: Tilleggshefte. 55 pages. ISBN: 82-486-0040-8.
  • Thomassen, Einar; Radtke, Bernd. 1993. The Letters of Ahmad ibn Idris.
  • Thomassen, Einar; Radtke, Bernd; Bernd, Radtke. 1993. The Letters of Ahmad Ibn Idris. Edited, translated and annotated by Albrecht Hofheinz, Ali Salih Karrar, R.S. 0Fahey, Bernd Radtke and Einar Thomassen. ISBN: 1-85065-158-2.
Journal articles
  • Thomassen, Einar. 2016. Gnostic Paradises. Warburg Institute Colloquia. 27: 95-107.
  • Thomassen, Einar. 2015. Anmeldelse av Kristin Brandtsegg Johansen, Maria Magdalena: Disippelen Jesus elsket. Salongen : Nettstedet for filosofi og idéhistorie. Published 2015-01-08.
  • Thomassen, Einar. 2015. (Review of) J. Rüpke (ed.),The Individual in the Religions of the Ancient Mediterranean. Classical Review. 65: 206-208. doi: 10.1017/ S0009840X14002844
  • Thomassen, Einar. 2014. Anmeldelse av Bart D. Ehrman, Forgery and Counterforgery. Journal of theological studies. 65: 241-243.
  • Thomassen, Einar. 2014. Are gods really moral monitors? Some comments on Ara Norenzayan’s Big Gods by a historian of religions. Religion. 44: 667-673. doi: 10.1080/0048721X.2014.937074
  • Thomassen, Einar. 2013. Guder og andre overmenneskelige aktører. DIN: Religionsvitenskapelig tidsskrift. 1. 105-111.
  • Thomassen, Einar. 2013. Anmeldelse av Jan N. Bremmer, The Rise of Christianity through the Eyes of Gibbon, Harnack and Rodney Stark. Numen. 60: 149-151.
  • Thomassen, Einar; Tsakos, Alexandros; Bull, Christian Hervik; Abercrombie, Lloyd. 2013. A New Edition of the Wizz Codex with an English Translation. Collectanea Christiana Orientalia. 10: 193-209.
  • Thomassen, Einar. 2011. Jakten på gnostiske egg. DIN: Religionsvitenskapelig tidsskrift. 1-2. 109-119.
  • Thomassen, Einar. 2011. Anmeldelse av Uwe-Karsten Plisch, Das Thomasevangelium. Originaltext mit Kommentar (Stuttgart 2007). Zeitschrift für antikes Christentum. 15: 360-361.
  • Thomassen, Einar. 2011. Minnetale over professor Alv Kragerud. Årbok / Det norske videnskaps-akademi. (2010): 175-179.
  • Thomassen, Einar. 2011. Anmeldelse av M. Ziegler, Successio. Die Vorsteher der stadrömischen Christengemeinde in den ersten beiden Jahrhunderten. Anzeiger für die Altertumswissenschaft. 64: 188-190.
  • Thomassen, Einar. 2010. Anmeldelse av Anders-Christian Jacobsen (ed.), The Discursive Fight over Religious Texts in Antiquity. Religionsvidenskapeligt Tidsskrift. 55. 90-94.
  • Thomassen, Einar. 2010. Anmeldelse av Ismo Dunderberg, Beyond Gnosticism: Myth, Lifestyle, and Society in the School of Valentinus. Journal of Religion in Europe. 3: 191-193.
  • Thomassen, Einar. 2010. Anmeldelse av Barbara Aland, Was ist Gnosis? Theologische Literaturzeitung. 12. 1330-1332.
  • Thomassen, Einar. 2010. Anmeldelse av Johanna Brankaer/Hans-Gebhadt Bethge, Codex Tchacos: Texte und Analysen. ISBN 978-3-11-019570-5. Zeitschrift für antikes Christentum. 13: 536-541. doi: 10.1515/ZAC.2009.36
  • Thomassen, Einar. 2010. Le valentinisme à Nag Hammadi. Comptes rendus des seances de l'année l'academie des inscriptions & belle-lettres. (2008): 1759-1770.
  • Stausberg, Michael; Thomassen, Einar; Cavallin, Clemens; Hopland, Karstein Olav; Fuglestad, Morten; Dahl, Gina; Gilhus, Ingvild S.; Tafjord, Bjørn Ola. 2008. Anmeldelse Arne Bugge Amundsen (red.), Norges religionshistorie, Universitetsforlaget, Oslo, 2005. DIN: Religionsvitenskapelig tidsskrift. 3. 60-78.
  • Thomassen, Einar. 2008. The Gospel of Judas, or, Is Philology a Science? Interdisciplinary Communications. 110-113.
  • Thomassen, Einar. 2007. Tidsskriftartikkelfetisjismen. Forskerforum. 29: 32-33.
  • Thomassen, Einar. 2004. The Epiphany of Gnosis. Illinois Classical Studies. 29: 217-226.
  • Thomassen, Einar. 2004. Anmeldelse av P. Mirecki og M. Meyer (utg.), Magic and Ritual in the Ancient World. Classical Review. 54: 443-445.
  • Thomassen, Einar. 2004. Anmeldelse av Ennio Sanzi, I culti orientali nell'impero romano: Un'antologia di fonti. Numen. 51: 359-360.
  • Thomassen, Einar. 2004. Orthodoxy and Heresy in Second Century Rome. Harvard Theological Review. 97: 241-256.
  • Thomassen, Einar. 2004. Om skaut og 'islam'. Bergens Tidende. 1 pages. Published 2004-01-29.
  • Thomassen, Einar. 2004. Dualisme på godt og ondt. Morgenbladet. 184. 4 pages. Published 2004-09-24.
  • Thomassen, Einar. 2003. Om å tolke Koranen. Religion og livssyn : Tidsskrift for religionslærerforeningen i Norge. 15: 42-47.
  • Thomassen, Einar. 2002. Moskeer i Norge. DIN: Religionsvitenskapelig tidsskrift. 2+3. 105.
  • Gravem, Peder; Mogstad, Sverre Dag; Rasmussen, Tarald; Thomassen, Einar. 2001. Fellesfag i forandring. VG : Verdens gang. 39-39. Published 2001-05-03.
  • Thomassen, Einar. 1998. Anmeldelse av G. Wurst, Die Bema-Psalmen. Orientalia Suecana. 47: 154-155.
  • Thomassen, Einar. 1998. Teologi og religionshistorie�mot en ny tverrfaglig identitet? Norsk Teologisk Tidsskrift. 99: 30-36.
  • Thomassen, Einar. 1998. Religionsvitenskap i skolen? Religion og livssyn : Tidsskrift for religionslærerforeningen i Norge. 10: 18-22.
  • Thomassen, Einar. 1997. Det misforståtte faget. Bergens Tidende. Published 1997-05-07.
  • Thomassen, Einar. 1997. Satansversene: Fiksjon og fakta. Chaos. Dansk-norsk tidsskrift for religionhistoriske studier. 28. 41-52.
  • Thomassen, Einar. 1996. Anmeldelse av A. Khosroyev, Die Bibliothek von Nag Hammadi: Einige Probleme des Christentums in Ägypten während der ersten Jahrhunderte. Bibliotheca Orientalis. 53: 810-812.
  • Thomassen, Einar. 1996. Fire innlegg om religionsvitenskapens fremtid: Innledning. Chaos. Dansk-norsk tidsskrift for religionhistoriske studier. 26. 129-130.
  • Thomassen, Einar. 1996. Anmeldelse av S. Richter, Exegetisch-literarkritische Untersuchungen von Herakleidespsalmen des koptisch-manichäischen Psalmenbuches. Acta Orientalia. 57: 163-165.
  • Thomassen, Einar. 1996. "Det nye religiøse Norge.". Bergens Tidende. Published 1996-08-20.
  • Thomassen, Einar. 1995. Spiseritualer blant de første kristne. Chaos. Dansk-norsk tidsskrift for religionhistoriske studier. 23: 65-74.
  • Thomassen, Einar. 1995. L´historie du valentinisme et le Trait#/e tripartite. Annuaire - Ecole pratique des hautes études, Section des sciences religieuses. 103: 301-303.
  • Thomassen, Einar. 1994. Exodus 1-15, exempelvis. Tro & tanke. 5: Om t. 91-104.
  • Thomassen, Einar. 1994. Gnostic Semiotics: The Valentinian Notion of the Name. Temenos. 29: 141-156.
  • Thomassen, Einar. 1994. J. Zandee: The Teachings of Sylvanus. Bibliotheca Orientalis. 50.
  • Thomassen, Einar. 1993. Gnostic Semiotics: The Valentinian Notion of the Name. Temenos. 29: 141-156.
  • Thomassen, Einar. 1993. Omtale av J. Zandee, The Teachings of Sylvanus. Bibliotheca Orientalis. 50: 414-416.
  • Thomassen, Einar. 1992. Målestokken og spanskrøret: Kanon som religionsvitenskapelig term. Chaos. Dansk-norsk tidsskrift for religionhistoriske studier. 18: 5-17.
Reports and theses
  • Thomassen, Einar; Jordan, David R.; Montgomery, Hugo. 1999. The world of ancient magic: Papers from the first International Samson Eitrem Seminar at the Norwegian Institute at Athens 4-8 May 1997. (Papers from the Norwegian Institute at Athens. MANGLER, Bergen.
  • Natvig, Richard; Brochmann, Randi; Dao-Vu, Dominique; Gilhus, Ingvild Sælid; Hope, Ingvild; Jacobsen, Knut A; Kallevik, Kjell Arne; Lyngra, Tove; Rian, Dagfinn; Rydving, Håkan; Thomassen, Einar. 1998. Studiehefte: Studierettleiing for fjernundervisningsstudentar i Religionsvitskap delfag. Modul 1. Seksjon for religionsvitskap, Universitetet i Bergen. 50 pages.
  • Thomassen, Einar. 1994. Islam. AL Biblioteksentralen.
Book sections
  • Thomassen, Einar. 2017. The Melothesia of the Apocryphon of John and the Umm al-kitāb. Kapittel, pages 161-172. In:
    • Van den Kerchove, Anna; Soares Santoprete, Luciana Gabriela. 2017. Gnose et manichéisme. Entre les oasis d’Égypte et la Route de la Soie. Hommage à Jean-Daniel Dubois. Brepols. 970 pages. ISBN: 978-2-503-56763-1.
  • Thomassen, Einar. 2016. Holy Book of the Invisible Spirit, The (NHC III,2; IV,2). Artikkel, pages 121-122. In:
    • Allison, Dale C. 2016. Encyclopedia of the Bible and Its Reception, vol. 12: Ho Tsun Shen-Insult. Walter de Gruyter. 671 pages. ISBN: 978-3-11-031329-1.
  • Thomassen, Einar. 2016. Hypsiphrone (NHC XI, 4). Artikkel, pages 685-686. In:
    • Allison, Dale C. 2016. Encyclopedia of the Bible and Its Reception, vol. 12: Ho Tsun Shen-Insult. Walter de Gruyter. 671 pages. ISBN: 978-3-11-031329-1.
  • Thomassen, Einar. 2016. Bridal Chamber. Artikkel, pages 149-149. In:
    • Orlin, Eric. 2016. The Routledge Encyclopedia of Ancient Mediterranean Religions. Routledge. ISBN: 978-0-415-83197-0.
  • Thomassen, Einar. 2016. Interpretation of Knowledge, The (NHC XI,1). Artikkel, pages . In:
    • Allison, Dale C. 2016. Encyclopedia of the Bible and Its Reception, vol. 12: Ho Tsun Shen-Insult. Walter de Gruyter. 671 pages. ISBN: 978-3-11-031329-1.
  • Thomassen, Einar. 2016. What Is a “God” Actually?: Some Comparative Reflections. Artikkel, pages 365-374. In:
    • Antes, Peter; Geertz, Armin W.; Rothstein, Mikael. 2016. Contemporary Views on Comparative Religion. Equinox Publishing. 506 pages. ISBN: 978-1-78179-139-4.
  • Thomassen, Einar. 2016. Sophia. Artikkel, pages 897-898. In:
    • Orlin, Eric. 2016. The Routledge Encyclopedia of Ancient Mediterranean Religions. Routledge. ISBN: 978-0-415-83197-0.
  • Thomassen, Einar. 2016. Johannine Literature. Artikkel, pages 483-483. In:
    • Orlin, Eric. 2016. The Routledge Encyclopedia of Ancient Mediterranean Religions. Routledge. ISBN: 978-0-415-83197-0.
  • Thomassen, Einar. 2015. Gnosis, Gnosticism, I General. Artikkel, pages 341-342. In:
    • Allison, Dale C.; Helmer, Christine; Seow, Choon-Leong; Spieckermann, Hermann; Walfish, Barry Dov; Ziolkowski, Eric. 2015. Encyclopedia of the Bible and Its Reception, volume 10. Walter de Gruyter. 1213 pages. ISBN: 978-3-11-018378-8.
  • Thomassen, Einar. 2015. Gnosis, Gnosticism, II Gnosis and New Testament. Artikkel, pages 343-344. In:
    • Allison, Dale C.; Helmer, Christine; Seow, Choon-Leong; Spieckermann, Hermann; Walfish, Barry Dov; Ziolkowski, Eric. 2015. Encyclopedia of the Bible and Its Reception, volume 10. Walter de Gruyter. 1213 pages. ISBN: 978-3-11-018378-8.
  • Thomassen, Einar. 2015. Gospel of Truth, The (NHC I,3; XII,2). Artikkel, pages 700-701. In:
    • Allison, Dale C.; Helmer, Christine; Seow, Choon-Leong; Spieckermann, Hermann; Walfish, Barry Dov; Ziolkowski, Eric. 2015. Encyclopedia of the Bible and Its Reception, volume 10. Walter de Gruyter. 1213 pages. ISBN: 978-3-11-018378-8.
  • Thomassen, Einar. 2015. Gnosis, Gnosticism, VI.A Patristic and Orthodox Churches. Artikkel, pages 361-363. In:
    • Allison, Dale C.; Helmer, Christine; Seow, Choon-Leong; Spieckermann, Hermann; Walfish, Barry Dov; Ziolkowski, Eric. 2015. Encyclopedia of the Bible and Its Reception, volume 10. Walter de Gruyter. 1213 pages. ISBN: 978-3-11-018378-8.
  • Thomassen, Einar. 2015. Filologiens videnskabelighet. Kapittel 4, pages 121-143. In:
    • Jensen, Tim; Geertz, Armin W. 2015. Religionsforskningen før og nu. II. Nyere tid. Gyldendal Undervisning. 629 pages. ISBN: 978-87-02-04693-9.
  • Thomassen, Einar. 2014. Exegesis on the Soul, The (NHC II,6). Leksikonartikkel, pages 381-382. In:
    • Klauck, Hans-Josef. 2014. Encyclopedia of the Bible and its reception. Vol. 8 Essenes - Fideism. Walter de Gruyter. 600 pages. ISBN: 978-3-11-018376-4.
  • Thomassen, Einar. 2014. Eugnostos the Blessed (NHC III,3; V,1). Leksikonartikkel, pages 168-169. In:
    • Klauck, Hans-Josef. 2014. Encyclopedia of the Bible and its reception. Vol. 8 Essenes - Fideism. Walter de Gruyter. 600 pages. ISBN: 978-3-11-018376-4.
  • Thomassen, Einar. 2013. The Valentinian Materials in James (NHC V,3 and CT,2). Kapittel, pages 79-90. In:
    • Iricinschi, Eduard; Jenott, Lance; Lewis, Nicola Denzey; Townsend, Philippa. 2013. Beyond the Gnostic Gospels: Studies Building on the Work of Elaine Pagels. Mohr Siebeck. 517 pages. ISBN: 978-3-16-152834-7.
  • Thomassen, Einar. 2013. Dialogue of the Saviour, The (NHC III,5). Leksikonartikkel, pages 746-747. In:
    • Klauck, Hans-Josef. 2013. Encyclopedia of the Bible and its reception. Vol. 6: Dabbesheth-dreams and dream interpretation. Walter de Gruyter. ISBN: 9783110183740.
  • Thomassen, Einar. 2013. Going to Church With the Valentinians. Kapittel, pages 183-197. In:
    • DeConick, April D.; Shaw, Gregory; Turner, John D. 2013. Practicing Gnosis: Ritual, Magic, Theurgy and Liturgy in Nag Hammadi, Manichaean and Other Ancient Literature. Essays in Honor of Birger A. Pearson. Brill Academic Publishers. 581 pages. ISBN: 978-90-04-25629-3.
  • Thomassen, Einar. 2013. Saved by nature? The question of human races and soteriological determinism in Valentinianism. Kapittel, pages 129-149. In:
    • Markschies, Christoph; Oort, Johannes van. 2013. Zugänge zur Gnosis: Akten zur Tagung der Patristischen Arbeitsgemeinschaft vom 02.-05.01.2011 in Berlin-Spandau. Peeters Publishers. ISBN: 9789042927179.
  • Thomassen, Einar. 2013. Ikke bare Bibelen: Hellige skrifter i antikken. Kapittel, pages 62-78. In:
    • Gilhus, Ingvild S.; Mikaelsson, Lisbeth. 2013. Religion i skrift: Mellom mystikk og materialitet. Universitetsforlaget. 240 pages. ISBN: 9788215019895.
  • Thomassen, Einar. 2013. Sethian Names in Magical Texts: Protophanes and Meirotheos. Kapittel, pages 63-77. In:
    • Corrigan, Kevin; Rasimus, Tuomas. 2013. Gnosticism, Platonism and the Late Ancient World: Essays in Honour of John D. Turner. Brill Academic Publishers. ISBN: 9789004223837.
  • Thomassen, Einar. 2013. Discourse on the Eighth and Ninth, The (NHC VI,6). Leksikonartikkel, pages 919-920. In:
    • Klauck, Hans-Josef. 2013. Encyclopedia of the Bible and its reception. Vol. 6: Dabbesheth-dreams and dream interpretation. Walter de Gruyter. ISBN: 9783110183740.
  • Thomassen, Einar. 2012. Concept of Our Great Power (NHC VI,4). Artikkel, pages 596-597. In:
    • Klauck, Hans-Josef. 2012. Encyclopedia of the Bible and its reception. Vol. 5: Charisma - Czaczkes. Walter de Gruyter. 1230 pages. ISBN: 978-3-11-018373-3.
  • Thomassen, Einar. 2012. What is Heresy, and Why Did it Matter? Kapittel, pages 191-201. In:
    • Ulrich, Jörg; Brakke, David; Jacobsen, Anders-Christian. 2012. Invention, rewriting, usurpation : discursive fights over religious traditions in Antiquity. Peter Lang Publishing Group. 322 pages. ISBN: 978-3-631-63538-4.
  • Thomassen, Einar. 2012. Egypt som paradiset. Kapittel, pages 299-306. In:
    • Jensen, Tim; Rothstein, Mikael. 2012. Den sammenklappelige tid. Forlaget Chaos. 454 pages. ISBN: 978-87-994619-9-8.
  • Thomassen, Einar. 2011. Philology. Kapittel, pages 346-354. In:
    • Stausberg, Michael; Engler, Steven. 2011. The Routledge Handbook of Research Methods in the Study of Religion. Routledge. ISBN: 978-0-415-55920-1.
  • Thomassen, Einar. 2011. Barbelo-Gnostics. L, pages 509-510. In:
    • Klauck, Hans-Josef. 2011. Encyclopedia of the Bible and Its Reception, Vol. 3: Athena - Birkat ha-Minim. Walter de Gruyter. 1267 pages. ISBN: 978-3-11-018371-9.
  • Thomassen, Einar. 2011. Baptism among the Valentinians. Kapittel i del 2, pages 895-915. In:
    • Hellholm, David; Vegge, Tor; Norderval, Øyvind; Hellholm, Christer. 2011. Ablution, initiation, and baptism : late antiquity, early Judaism, and early Christianity. Walter de Gruyter. 2024 pages. ISBN: 978-3-11-024751-0.
  • Thomassen, Einar. 2011. Valentinus and the Valentinians. Intervju, pages 105-115. In:
    • Conner, Miguel. 2011. Voices of Gnosticism. 242 pages. ISBN: 978-1906834128.
  • Thomassen, Einar. 2011. Authoritative Teaching (NHC VI,3). Leksikonartikkel, pages 114. In:
    • Klauck, Hans-Josef. 2011. Encyclopedia of the Bible and Its Reception, Vol. 3: Athena - Birkat ha-Minim. Walter de Gruyter. 1267 pages. ISBN: 978-3-11-018371-9.
  • Thomassen, Einar; Suciu, Alin. 2011. An Unknown ‘Apocryphal’ Text from the White Monastery. Kapittel, pages 477-499. In:
    • Buzi, Paola; Camplani, Alberto. 2011. Christianity in Egypt: Literary Production and Intellectual Trends. Studies in Honor of Tito Orlandi. 653 pages. ISBN: 88 7961 135 6.
  • Thomassen, Einar. 2010. Orphics and Gnostics. Artikkel, pages 463-473. In:
    • Dijkstra, Jitse; Kroesen, Justin; Kuiper, Yme. 2010. Myths, Martyrs, and Modernity: Studies in the History of Religions in Honour of Jan N. Bremmer. Brill Academic Publishers. 701 pages. ISBN: 978-90-04-18089-5.
  • Thomassen, Einar. 2010. Some Notes on the Development of Christian Ideas about a Canon. Artikkel, pages 9-28. In:
    • Thomassen, Einar. 2010. Canon and Canonicity: The Formation and Use of Scripture. Museum Tusculanums Forlag. 232 pages. ISBN: 978-87-635-3027-9.
  • Thomassen, Einar. 2010. Le valentinisme à Nag Hammadi. Kapittel, pages 239-249. In:
    • Mahé, Jean-Pierre; Poirier, Paul-Hubert; Scopello, Madeleine. 2010. Les textes de Nag Hammadi: Histoire des religions et approches contemopraines. 284 pages. ISBN: 978-2-87754-250-0.
  • Thomassen, Einar. 2010. Heracleon. Artikkel, pages 173-210. In:
    • Rasimus, Tuomas. 2010. The Legacy of John: Second-Century Reception of the Fourth Gospel. Brill Academic Publishers. 406 pages. ISBN: 978-90-04-17633-1.
  • Thomassen, Einar. 2009. Archon/Archons. II. Christianity. Artikkel, pages . In:
    • Klauck, Hans-Josef. 2009. Encyclopedia of the Bible and Its Reception. Vol. 1: Aaron-Aniconism. Walter de Gruyter. 1223 pages. ISBN: 978-3110183559.
  • Thomassen, Einar. 2009. Allogenes (NHC XI,3). Artikkel, pages . In:
    • Klauck, Hans-Josef. 2009. Encyclopedia of the Bible and Its Reception. Vol. 1: Aaron-Aniconism. Walter de Gruyter. 1223 pages. ISBN: 978-3110183559.
  • Thomassen, Einar. 2009. Adam, The Apocalypse of (NHC V,5). Artikkel, pages . In:
    • Klauck, Hans-Josef. 2009. Encyclopedia of the Bible and Its Reception. Vol. 1: Aaron-Aniconism. Walter de Gruyter. 1223 pages. ISBN: 978-3110183559.
  • Thomassen, Einar. 2009. Jesus in the New Testament Apocrypha. Chapter 3, pages 33-50. In:
    • Hammer, Olav. 2009. Alternative Christs. Cambridge University Press. 315 pages. ISBN: 978-0-521-88902-5.
  • Thomassen, Einar. 2009. Valentinian ideas about salvation as transformation. kapittel, pages 169-186. In:
    • Seim, Turid Karlsen; Økland, Jorunn. 2009. Metamorphoses: Resurrection, body and transformative practices in early Christianity. Walter de Gruyter. 401 pages. ISBN: 978-3-11-020298-4.
  • Thomassen, Einar. 2009. Dialogues with the Archons: The Post-mortem Encounters of the Ascending Soul in Gnostic Texts. Kapitel, pages 351-369. In:
    • Nicklas, Tobias; Reiterer, Friedrich V.; Verheyden, Joseph. 2009. Deuterocanonical and Cognate Literature Yearbook 2009: The Human Body in Death and Resurrection. Walter de Gruyter. 470 pages. ISBN: 978-3-11-020880-1.
  • Thomassen, Einar. 2009. Asclepius (NHC VI,8. Artikkel, pages . In:
    • Klauck, Hans-Josef. 2009. Encyclopedia of the Bible and Its Reception. Vol. 2 : Anim-Atheism. Walter de Gruyter. 1207 pages. ISBN: 978-3110183702.
  • Thomassen, Einar. 2008. Kjetteri i middelalderen: katarene. 4, pages 76-96. In:
    • Hagg, Tomas. 2008. Kjetterne og kirken. Fra antikken til i dag. Spartacus. 255 pages. ISBN: 978-82-304-0036-4.
  • Thomassen, Einar. 2008. Kilder og arbejdsredskaper til studiet af gnosticismen. Artikkel, pages 299-314. In:
    • Klostergaard Petersen, Anders; Hyldahl, Jesper; Thomassen, Einar. 2008. Mellem venner og fjender : en folkebog om Judasevangeliet, tidlig kristendom og gnosis. Forlaget ANIS. 334 pages. ISBN: 978-87-7457-455-2.
  • Thomassen, Einar. 2008. Is Judas really the Hero of the Gospel of Judas? Artikkel, pages 157-170. In:
    • Scopello, Madeleine. 2008. The Gospel of Judas in Context. Brill Academic Publishers. 419 pages. ISBN: 978-90-04-16721-6.
  • Thomassen, Einar. 2008. Judasevangeliet og gnosticismen. Artikkel, pages 143-166. In:
    • Klostergaard Petersen, Anders; Hyldahl, Jesper; Thomassen, Einar. 2008. Mellem venner og fjender : en folkebog om Judasevangeliet, tidlig kristendom og gnosis. Forlaget ANIS. 334 pages. ISBN: 978-87-7457-455-2.
  • Thomassen, Einar. 2008. Kjetteribegrepets opprinnelse og de første kjetterne. 1, pages 12-32. In:
    • Hagg, Tomas. 2008. Kjetterne og kirken. Fra antikken til i dag. Spartacus. 255 pages. ISBN: 978-82-304-0036-4.
  • Thomassen, Einar. 2007. The Treatise on Resurrection. Innledning, pages 49-51. In:
    • Meyer, Marvin. 2007. The Nag Hammadi Scriptures: The International Edition. HarperCollins Publishers. 857 pages. ISBN: 0-06-052378-6.
  • Thomassen, Einar. 2007. Tekstkritikk og kanon. Artikkel, pages 142-157. In:
    • Haugen, Odd Einar; Janss, Christian; Modalsli, Tone. 2007. Filologi og hermeneutikk. Bidrag til ein konferanse halden av Nordisk Nettverk for Edisjonsfilologar 16.-18. september 2005. Novus Forlag. 182 pages. ISBN: 978-82-560-1576-4.
  • Thomassen, Einar. 2007. Forord. Forord, pages 7-9. In:
    • Kasser, Rodolphe; Meyer, Marvin; Wurst, Gregor. 2007. Judasevangeliet. 152 pages. ISBN: 978-82-92605-07-3.
  • Thomassen, Einar. 2007. The Gospel of Truth. Innledning, pages 31-35. In:
    • Meyer, Marvin. 2007. The Nag Hammadi Scriptures: The International Edition. HarperCollins Publishers. 857 pages. ISBN: 0-06-052378-6.
  • Thomassen, Einar. 2007. The Tripartite Tractate. Innledning, oversettelse og noter, pages 57-101. In:
    • Meyer, Marvin. 2007. The Nag Hammadi Scriptures: The International Edition. HarperCollins Publishers. 857 pages. ISBN: 0-06-052378-6.
  • Thomassen, Einar. 2007. The Valentinian School of Gnostic Thought. Kapittel, pages 790-794. In:
    • Meyer, Marvin. 2007. The Nag Hammadi Scriptures: The International Edition. HarperCollins Publishers. 857 pages. ISBN: 0-06-052378-6.
  • Thomassen, Einar. 2007. Den gnostiske reisen. Kapittel 11, pages 165-178. In:
    • Gilhus, Ingvild S.; Kraft, Siv-Ellen. 2007. Religiøse reiser: Mellom gamle spor og nye mål. Universitetsforlaget. 205 pages. ISBN: 978-82-15-01163-9.
  • Thomassen, Einar. 2007. IV. Les écrits valentiniens de Nag Hammadi. Kapittel, pages xliii-li. In:
    • Mahé, Jean-Pierre; Poirier, Paul-Hubert. 2007. Écrits gnostiques. La bibliothèque de Nag Hammad. Gallimard. 1917 pages. ISBN: 978-2-07-011333-0.
  • Thomassen, Einar. 2007. From Wisdom to Gnosis. Artikkel, pages 585-598. In:
    • Painchaud, Louis; Poirier, Paul-Hubert. 2007. Colloque international: «L’Évangile selon Thomas et les textes de Nag Hammadi». Peeters Publishers. 672 pages. ISBN: 978-90-429-2055-2.
  • Thomassen, Einar. 2007. “Forgery” in the New Testament. Artikkel, pages 141-157. In:
    • Lewis, James R.; Hammer, Olav. 2007. The Invention of Sacred Tradition. Cambridge University Press. 318 pages. ISBN: 978-0-521-86479-4.
  • Thomassen, Einar. 2007. The Interpretation of Knowledge. Innledning, oversettelse og noter, pages 651-662. In:
    • Meyer, Marvin. 2007. The Nag Hammadi Scriptures: The International Edition. HarperCollins Publishers. 857 pages. ISBN: 0-06-052378-6.
  • Thomassen, Einar; Painchaud, Louis. 2007. Interprétation de la gnose (NH XI, 1). Innledning, oversettelse og noter, pages 1469-1499. In:
    • Mahé, Jean-Pierre; Poirier, Paul-Hubert. 2007. Écrits gnostiques. La bibliothèque de Nag Hammad. Gallimard. 1917 pages. ISBN: 978-2-07-011333-0.
  • Thomassen, Einar; Painchaud, Louis. 2007. Traité tripartite (NH I, 5). Innledning, oversettelse og noter, pages 109-204. In:
    • Mahé, Jean-Pierre; Poirier, Paul-Hubert. 2007. Écrits gnostiques. La bibliothèque de Nag Hammad. Gallimard. 1917 pages. ISBN: 978-2-07-011333-0.
  • Thomassen, Einar; Pasquier, Anne. 2007. L’Évangile de la vérité (NH I, 3; XII, 2). Innledning, oversettelse og noter, pages 43-84. In:
    • Mahé, Jean-Pierre; Poirier, Paul-Hubert. 2007. Écrits gnostiques. La bibliothèque de Nag Hammad. Gallimard. 1917 pages. ISBN: 978-2-07-011333-0.
  • Thomassen, Einar. 2006. Religious Education in a Pluralistic Society: Experiences from Norway. Artikkel, pages 257-266. In:
    • Pye, Michael. 2006. Religious Harmony: Problems, Practice and Education. Walter de Gruyter. 373 pages. ISBN: 978-3-11-018847-9.
  • Thomassen, Einar. 2006. Gos. Philip 67:27–30: not “in a mystery”. Artikkel, pages 925-939. In:
    • Painchaud, Louis; Poirier, Paul-Hubert. 2006. Coptica—Gnostica—Manichaica. Mélanges offerts à Wolf-Peter Funk. Peeters Publishers. 1052 pages. ISBN: 90-429-1771-7.
  • Thomassen, Einar. 2006. Hva enhver student i religionsvitenskap trnger å vite om filologi. Kapittel, pages 72-88. In:
    • Kraft, Siv Ellen; Natvig, Richard Johan. 2006. Metode i religionsvitenskap. Pax Forlag. 275 pages. ISBN: 82-530-2839-3.
  • Thomassen, Einar. 2006. The Reception of Greco-Roman Religious and Cultic Terminology in Judaism and Christianity, with Special Reference to Sacrificial Terminology. Artikkel, pages 137-153. In:
    • Brakke, David; Jacobsen, Anders-Christian; Ulrich, Jörg. 2006. Beyond Reception: Mutual Influences between Antique Religion, Judaism, and Early Christianity. Peter Lang Publishing Group. 245 pages. ISBN: 3-631-55583-0.
  • Thomassen, Einar. 2004. Sacrifice: Ritual murder or dinner party? Artikkel, pages 275-285. In:
    • Wedde, Michael. 2004. Celebrations: Sanctuaries and the vestiges of cult activity: Selected papers and discussions from the Tenth Anniversary Symposion of the Norwegian Institute at Athens, 12–16 May 1999. Paul Åström forlag. 303 pages. ISBN: 82-91626-23-5.
  • Thomassen, Einar. 2004. Musings on 'Syncretism'. artikkel, pages 137-147. In:
    • Kleine, Christoph; Schrimpf, Monika; Triplett, Katja. 2004. Unterwegs: Neue Pfade in der Religionswissenschaft. Festschrift für Michael Pye zum 65. Geburtstag. Biblion Verlag. 432 pages. ISBN: 3-932331-93-1.
  • Thomassen, Einar. 2003. Das norwegische Experiment mit Religionsunterricht für alle. 274-284. In:
    • Dommel, Christa; Heumann, Jürgen; Otto, Gert. 2003. WerteSchätzen: Religiöse Vielfalt und Öffentliche Bildung. Festschrift für Jürgen Lott zum 60. Geburtstag. ISBN: 3-88939-716-6.
  • Thomassen, Einar. 2003. Becoming a different person: Baptism as an initiation ritual. 209-222. In:
    • Martin, Luther H.; Pachis, Panayotis. 2003. Theoretical Frameworks for the Study of Greco-Roman Religions. ISBN: 960-12-1199-3.
  • Thomassen, Einar. 2002. "Jesu hemmelige ord: Thomasevangeliet og andre apokryfe evangelier". 85-94. In:
    • [Mangler etternavn], [Mangler fornavn]. 2002. P2-Akademiet Y. ISBN: 82-7118-283-8.
  • Thomassen, Einar. 2001. Et gnostisk syn på oppstandelsen. 128-133. In:
    • Engberg-Pedersen, Troels; Ingvild Sælid, Gilhus. 2001. Kropp og oppstandelse. Pax Forlag. ISBN: 82-530-2270-0.
  • Thomassen, Einar. 2000. Wilhelm Schencke—Norway’s First Professor in History of Religions. 223-236. In:
    • Sigurd, Hjelde. 2000. Man, Meaning and Mystery: 100 Years of History of Religions in Norway. The Heritage of W. Brede Kristensen.
  • Thomassen, Einar. 2000. The Derivation of Matter in Monistic Gnosticism. 1-17. In:
    • Turner, John D.; Majercik, Ruth. 2000. Gnosticism and Later Platonism: Themes, Figures, and Texts. ISBN: 0-88414-035-0.
  • Thomassen, Einar. 1999. "Is Magic a Subclass of Ritual?". In:
    • Jordan, David R.; Montgomery, Hugo; Thomassen, Einar. 1999. The world of ancient magic: Papers from the first International Samson Eitrem Seminar at the Norwegian Institute at Athens 4-8 May 1997. (Papers from the Norwegian Institute at Athens 4). ISBN: 82-91626-15-4.
  • Thomassen, Einar. 1999. Islam. 178-284. In:
    • Tarald, Rasmussen; Einar, Thomassen. 1999. Kildesamling til Kristendomskunnskap med religions- og livssynsorientering. ISBN: 82-486-0038-6.
  • Thomassen, Einar. 1999. "Is Philology Relevant?". 243-252. In:
    • Ahlbäck, Tore. 1999. Approaching Religion: Based on Papers Read at the Symposium on Methodology in the Study of Religions Held at Åbo, Finland, on the 4th�7th August 1997 (Scripta Instituti Donneriani Aboensis ; 17).
  • Thomassen, Einar; Rasmussen, Tarald. 1999. Humanismen. 506-571. In:
    • Tarald, Rasmussen; Einar, Thomassen. 1999. Kildesamling til Kristendomskunnskap med religions- og livssynsorientering. ISBN: 82-486-0039-4.
  • Thomassen, Einar. 1998. Moskérommet. 57-61. In:
    • [Mangler etternavn], [Mangler fornavn]. 1998. Bilde, rom og fortelling: Rapport fra etterutdanningskurset for lærere. Det teologiske fakultet, Universitetet i Oslo, Oslo.
  • Thomassen, Einar. 1998. Moskérommet. 57-61. In:
    • Montgomery, Ingun; Thorkildsen, Dag. 1998. Bilde, rom og fortelling. ISBN: 82-91397-06-6.
  • Thomassen, Einar. 1997. How Valentinian is The Gospel of Philip? 251-279. In:
    • Turner, John D; McGuire, Anne. 1997. The Nag Hammadi Library After Fifty Years: Proceedings of t he 1995 Society of Biblical Literature Commemoration.
  • Thomassen, Einar. 1996. "Welcoming a New Department". 139-142. In:
    • Pentikäinen, J. 1996. Religion: Global and Arctic Perspectives. ISBN: 82-91636-02-8.
  • Thomassen, Einar. 1995. Ortodoksi og heterodoksi i det andre århundrets Roma. 39-57. In:
    • Rubenson, Samuel. 1995. Patristica Nordica 4. Serie: Religio.
  • Thomassen, Einar. 1995. Logos apo siges proelthon (Ignatius, Mag. 8:2). 847-867. In:
    • Fornberg, Tord; Hellholm, David. 1995. Texts and Contexts: Biblical Texts in their Textual and Sit uational Contexts. Essays in Honor of Lars Hartman. ISBN: 82-00-22446-5.
  • Thomassen, Einar. 1995. Notes pour la d#/elimitation d'un corpus valentinien #`a Nag Hammadi. 243-263. In:
    • Painchaud, Louis; Pasquier, Anne. 1995. LES TEXTES DE NAG HAMMADI ET LE PROBL#`EME DE LEUR CLASSIFI CATION ACTES DU COLLOQUE TENU A QU#/EBEC DU 15 AU 19 SEPTEM BRE 1993 Serie: Bibliotheque copte de Nag Hammadi, Section "#/Etudes". ISBN: 2-7637-7435-0.
  • OFahey, Rex Seán; Thomassen, Einar. 1993. Letters to Makkib, Abd al-Aziz. 11-41. In:
    • Thomassen, Einar; Radtke, Bernd. 1993. The Letters of Ahmad ibn Idris.
  • Thomassen, Einar. 1993. The Platonic and the Gnostic "Demiurge". 226-244. In:
    • [Mangler etternavn], [Mangler fornavn]. 1993. Apocryphon Severini, presented to Søren Giversen.Editors Per Bilde,He lge Kjær Nielsen, and Jørgen Podemann Sørensen. Aarhus Universitetsforlag.

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