President, Society for Philosophy and Psychology. 2000 - 01. President, Cognitive Science Society. 1995 - 96, 1996 - 97. Annual Conference Oversight Committee, Cognitive Science Society. 1995 - 98. Governing Board, Cognitive Science Society. 1992 - 98. Executive Board, Society for Philosophy and Psychology. 1988 - 91, 1994 - 97. International Advisory Board, Cognitive Science Department, New Bulgarian University. 1993 - present. Editorial Board, Minds and Machines: Journal for Artificial Intelligence, Philosophy, and Cognitive Science. 1990 - present. Editorial Board, Cognitive Science. 1988 - present. Editorial Board, Connection Science: A Journal of Neural Computing, Artificial Intelligence, and Cognitive Research. 1988 - present. Advisory Board, Neural Network Series, MIT Press. 1990 - present. Advisory Editorial Board, Network: Computation in Neural Systems. 1989 - 91. Program Committee, Cognitive Science Society Conference, University of Pennsylvania, August 2000. Organizing Committee, Cognitive Science Society Conference, Stanford, CA, July 1997. Organizer, Symposium on Connectionism and Language, Annual Meeting of the American Association for the Advancement of Science, Baltimore, MD, February 1996. Program Committee, Association for Computational Linguistics Conference, Cambridge, MA, June 1995. Organizer, Symposium on Connectionism and Cognitive Science, First International Summer Institute in Cognitive Science, Buffalo, NY, July 1994. Organizing Committee, Cognitive Science Society Conference, Boulder, CO, June 1993. Organizing Committee, Connectionist Models Summer School, Boulder, CO, June 1993. Honorary Organizing Committee, Neural Networks Symposium, International Symposia on Information Sciences, Iizuka, Kyushu, Japan, July, 1992.