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• 12. November 2010: Det modulære isomorfismeproblemet for p-grupper, |G|=p^n, n< 5, Fredagsseminar, Institutt for matematikk og naturvitenskap, Universitetet i Stavanger.
• 9. January 2010: Det modulære isomorfismeproblemet for p-grupper G, |G|=p^n, n< 5, Ski og matematikk, Norsk matematisk forening, Rondane.
• 8. January 2010: Forkurs, oblig 0 og begynnerundervisningen for nye realfagsstudenter, Faglig-pedagogisk dag, UiO.
• 9. September 2009: Matematisk verktøykasse, presentasjon av bok, Matematisk bibliotek, Oslo.
• 4. February 2009: Differensiallikninger, Seminar for matematikk-lærere i videregående skole i Oslo, Oslo Handelsgymnasium.
• 5. January 2009: Fra Kunnskapsløft til Kvalitetsreform --eller hvordan gjøre matematikk-overgangen fra videregående til universitet så glatt som mulig?, Ski og matematikk, Norsk matematisk forening, Rondane.
• 30. October 2008: Abstrakt gruppeteori: Sylow og Thompson, grunnleggere og arvtagere, Nasjonalt algebramøte, UiO.
• 26. September 2008: Abelprisen 2008 og vår matematiske arv, Norsk matematikkråds årsmøte, Halden.
• 9. May 2008: John Thompson and finite group theory, Felleskollokviet, Matematisk institutt, Oslo
• 22. April 2008: Presentasjon av Abelprisen, Personalmøte, UMN, Oslo
• 'Faglig-pedagogisk dag', University of Oslo
  • 3. January 2008: Erfaringer fra forkurs i matematikk for nye realfagsstudenter
• 22. November 2007: Symmetrier og endelig matematikk, POPMAT, UiO
• 6. November 2007: Matematikken bak strekkoder, Personalmøte, UMN, Oslo
• 3. September 2007: Panel member; report from Norway, EWM 13th General Meeting, Cambridge, UK
• 'Åpen dag', University of Oslo
  • 8. March 2007: Strekkoder
  • 9. March 2006: Strekkoder
• 11. December 2006: Spektralsekvenser, Studentseminaret i algebraisk geometri, UiO.
• 4. November 2006: Endelig gruppeteori, Konferanse for Matematikk-studenter i Norge (KoMiN), Trondheim. Reportasje.
• October 2005: Modellaksiomene for kjedekomplekser, SUP-seminars, Oslo.
• 2004-2005: Seminar series, Oslo.
• 6. January 2005: On $p$-groups and modular group algebras, 24. Nordic and 1. Franco-Nordic Congress of Mathematicians, Reykjavik, Iceland.
• 28. August 2004: On the modular isomorphism problem, International workshop 'Groups, algebras and geometries', Alden Biesen, Belgium.
• 26. January 2004: Schur multiplikatoren, Seminar i Algebra og Algebraisk Geometri, Oslo.
• 8.-9. January 2004: Noen episoder fra den endelige gruppeteoriens historie (2 foredrag), 'Ski og Matematikk', Rondane.
• 11. December 2003:The modular isomorphism problem, Symposium on 'Representations of finite dimensional algebras', University of Warwick, Coventry.
• 14. November 2003:Endelig gruppeteori: gamle problemer og nye perspektiver, Felleskollokviet (Department Colloquium), Oslo.
• 11. June 2003:Solving the modular isomorphism problem, Algebra och Geometriseminarie, KTH and Stockholms Universitet, Stockholm.
• 30. April 2003: Det modulære isomorfismeproblemet, Algebra Seminar, Department of Mathematical Sciences, Århus.
• 17. February 2003: Solving the modular isomorphism problem, Seminar i Algebra og Algebraisk Geometri, Oslo.
• 16. September 2002: Dades moteksempel: Deux groupes finis distincts ayant la m\^{e}me alg\`{e}bre de groupe sur tout corps (in Norwegian), Seminar i Algebra og Algebraisk Geometri, Oslo.
• 28. January 2002: En kohomologisk vinkling på det modulære isomorfismeproblemet, Seminar i Algebra og Algebraisk Geometri, Oslo.
• 12. November 2001: A cohomological approach to the modular isomorphism problem, Seminar \"uber Algebra und Topologie, ETH Z\"urich.
• 24. August 2001: Studying $p$-groups using homological algebra, Department of Mathematics and Computer Science Colloquium, Leicester.
• 12. July 2001: Presentation of current research, Mathematics Seminar, University of Kent at Canterbury.
• 29. May 2001: A cohomological approach to the modular isomorphism problem, The Oxford University Algebra Seminar, Oxford.
• 20. April 2001: A cohomological approach to the modular isomorphism problem, Postgraduate Group Theory Conference, Imperial College, London.
• 13. March 2000: Classification of $p$-groups using cohomological methods, Marie Curie Fellows' workshop, Linacre College, Oxford.
• 26. May 1999: Cohomological methods in group theory, Marie Curie Fellows in Oxford's Interdisciplinary workshop, Halifax House, Oxford.
• 8. January 1998: Classification of $p$-groups using cohomological methods, 'Ski og Matematikk', Rondane.
• Over 20 talks in the Junior Group Theory seminar, the Advanced Class in Algebra and the Kinder Seminar in Algebra while I was a D. Phil. student at the Mathematical Institute, Oxford University (1997-2001). Some selected titles:
  • Products in spectral sequences: Cup product in the Serre spectral sequence.
  • The Lyndon-Hochschild-Serre spectral sequence.
  • Describing and building a spectral sequence.
  • Homological algebra -what and why?
  • Lie methods in growth of groups and groups of finite width.
  • Passman's solution of the modular isomorphism problem for groups of order 16.
  • The Golod-Shafarevich inequality for finite $p$-groups.
  • The Schur multiplier of a direct product.
  • Finiteness conditions for modules, rings and topological spaces with a view towards algebraic geometry.
  • Metacyclic $p$-groups: Split groups and 0-deficiency presentations.
  • Metacyclic $p$-groups: Investigation of parameters and isomorphic groups.
  • Derivations, tangentspaces and modules of differentials.
  • The Universal Coefficient Theorem and a calculation.
  • The long-exact cohomology sequence, derived functors and cohomology of groups.
  • Homotopy.
  • The isomorphism problem for group algebras.
  • Presenting groups of homeomorphisms.
  • Cryptology.