On The coevolution of old and media. Lecture, Ph.d. Course "The Evolution of Media: From Face-to-Face to Facebook." FMKJ/Cophenhagen 6-7.3  2008. Copenhagen University.

Invited speaker, Complutense International Seminar. Madrid (November 22, 23, 24th 2007) The Nordic Model of the Information and Knowledge Society.

Public spaces, New Landscapes, Limits, and Interfaces. International Ph.d. course, NORFA, Helsinki 14-15th August 2007.

Guest lecture. From Buildings & Books to Bytes. Why not put the Library on the Shelf?. The Danish Institute, Athens. Greece. April 2006.

Keynote, From Buildings & Books to Bytes. Why not put the Library on the Shelf? International conference on The future of Libraries, BOBCATTS, Tallinn. Feb. 2006.

Invited Panelist, "On digital Media Theory". 1. European Communication Conference, ECREA, Amsterdam dec. 2005.

Keynote speaker & workshop leader at the Conference »Creativity and Technology«, Reykjavik 19-22.3 2004. Org. by Cambridge & Iceland Universities.

Program chair (with Niels Brügger) International Ph.d.-course ”New Media, New Methods, New Theories?” NORFA, Sandbjerg, Denmark, Dec. 1-5. 2003.

Invited speaker, International Seminar, Universidad Complutense, Madrid, September 17. 18.19 2003. Media Cultures and NIT in the Nordic Countries and the Iberian Peninsula.

Closing Remarks on The new Media Matrix and its Importance for Media History. Seminar on »Media History – Theories, Methods, Analysis«. 16, 17.5 1999. Inst. For Informations- og Medievidenskab, Aarhus. 17.5 1999.

Invited speaker at the  seminar »The Humanities – Past, Present, Future«, Doreen B. Townsend Centre for the Humanities, Univ. of California, Berkeley, 12.3 1999.

Keynote, "The computer - a Machine, a Medium and a Signsystem". NASS Research Course in Media Semiotics. Sundvolden, Norway June 21-27. 1998.

Keynote, Int. Ph. D.course »Challenge of Information Society for Communication Theory«, Tampere University, Finland, 17-18.1 1997.

Guest lecture, Computeren som humanistisk forskningfelt. Symposium om Dokumentasjonsvitenskapens Plass i Informasjonssamfunnet. Åbningskonference for uddannelsen i Dokumentasjonsvitenskab. Tromsø  Universitet; Norge 24-25.4 1994. (Humanities Perspectives on the Computer)

Guest editor AI & Society, vol 4.4, Springer Verlag, London 1990.

Invited speaker, conference on The Culture of the Artificial.Lugano, Oct. 1990.