Professional Experience

March - April, 2002

Visiting professor, Hebrew University, Jerusalem.

Aug., 2001 - July, 2002

Visiting professor, CWI (Amsterdam) and University of Amsterdam.

Aug., 1996 - present

Professor, Computer Science Department, Cornell University

Co-director, Cognitive Studies Program, Cornell University

Sept., 1991 - 1996

Consulting (full) professor, Stanford University

January, 1990 - April, 1990

Visiting professor, University of Toronto (on sabbatical from IBM)

April, 1987 - December, 1989

Manager, Mathematics and related computer science department, IBM Almaden Research Center (managed five groups, consisting of roughly 30 people)

Sept., 1987 - Aug., 1991

Consulting associate professor, Stanford University

Sept., 1985 - Aug., 1987

Consulting assistant professor, Stanford University

Sept., 1984 - June, 1985

Visiting Industrial Professor, Stanford University

Aug., 1982 - 1996

Research staff member, IBM Research

July, 1981 - July, 1982

Postdoctoral fellow, Harvard University and Massachusetts Institute of Technology (joint appointment)

Sept., 1978 - June, 1980

Teaching fellow in mathematics, Harvard University

Sept., 1975 - June, 1977

Head of mathematics department, Bawku Secondary School, Ghana (with CUSO, Canadian University Services Overseas, the Canadian version of the Peace Corps)