3. Other scientific activities

• Contributor to the Mathematical Reviews since 1976
• Reviewer of the International Colloquium on Automata, Languages, and Programming, and several other international conferences and scientific journals.
• Organizing chairman of the Second Finnish Summer School on Theoretical Computer Science in Parainen, August 26-29, 1985
• Organizing chairman of the International Summer School on Alternatives of Logic Programming, Kuopio, May 23-25, 1989
• Organizing chairman of the Seventh Finnish Summer School on Computer Science in Liperi, January 10-12, 1994
• Organizing chairman of the Fourth Summer School on Novel Computing in Joensuu, August 12-16, 1996.
• Opponent of doctoral dissertations at University of Turku, University of Tampere, Polytechnical University of Madrid, Paul Sabatier University in Toulouse, University of Stockholm, Helsinki University of Technology, Lappeenranta University of Technology, and University of Helsinki.
• Guest lectures at the universities of Waterloo, London Ontario, Oxford, Toulouse, Lyon, Madrid, San Sebastian, Barcelona, Warsaw, Prague, Bucharest, Petrozavodsk, Umeå, Århus, Copenhagen, Cadiz, and many Finnish universities and other organizations.
• Board member of the Finnish Society for Computer Science, 1989-1990.
• Member of the coordinating committee of the Finnish postgraduate program on computer science since 1989. Coordinating professor of the committee in 1994-1996, and chairman since 1996.
• Editor of the electronically published Journal of Universal Computer Science

Publications on a separate list