Memberships
Academies
- The Finnish Academy of Science and Letter, Finland 1994–
- The Finnish Academy of Technology, Finland 1992–
- International Informatization Academy, Moscow (Academician) 1997–
- St. Petersburg Academy of Sciences (Academician) 1999–
Societies
- Finnish Information Technology Society
- Mathematical Union of Finland
- Finnish Technical Society
- Operation Research
- American Mathematical Society
- Society for Industrial and Applied Mathematics (SIAM)
- Institute of Mathematics and its Applications (IMA)
- Institute of Electrical and Electronics Engineers (IEEE, Senior Member)
- Gesellschaft für Angewandte Mathematik und Mechanik (GAMM)
- The Association of Parliament Members and Scientists (TUTKAS, tutkijat ja kansanedustajat)
- Finnish Society for Future Studies (Tulevaisuuden tutkimuksen seura)
- Finnish Mechanics Society (Suomen mekaniikkaseura)
Organizations
- ECCOMAS (European Community on Computational Methods in Applied Sciences), member of the board 2000–, Vice President 2005–2013