Academic Background
M.S. Mathematics  Moscow State Pedagogical University  1971
Ph.D. Mathematics  Moscow State Pedagogical University  1973
Professor of Mathematics, Art History, Film Studies, University of Colorado  1979  present
Long Term Visiting Scholar, DIMACS (Center for Discrete Mathematics & Theoretical Computer Science), Rutgers University, January 2003August 2004 ; and 20062007 academic year.
Visiting FellowResearch Collaborator, Department of Mathematics, Princeton University, December 2002August 2004 , and 20062007 academic year.
My recent research work in Mathematics
Axiom of choice and chromatic number of the plane
Participation in Mathematics Competitions
20142018

President, WORLD FEDERATION OF NATIONAL MATHEMATICS COMPETITIONS

20082012

Senior Vice President and Chair of Program Committee, WORLD FEDERATION OF NATIONAL MATHEMATICS COMPETITIONS

19962008

Secretary, Member of the Executive and Program Committee, WORLD FEDERATION OF NATIONAL MATHEMATICS COMPETITIONS 
19962005 
Member, UNITED STATED OF AMERICA MATHEMATICS OLYMPIAD SUBCOMMITTEE 
1983Present 
Chair and Founder, COLORADO MATHEMATICAL OLYMPIAD 
19701974 
Member of the Jury, Soviet Union National Mathematical Olympiad 
