• John Simon Guggenheim Memorial Fellow,
1973-74
• Christian and Mary Lindback Award for excellence
of undergraduate teaching, 1973
• Award for Distinguished College or University
Teaching of Mathematics, Eastern Pennsylvania
and Delaware Section of the Mathematical Association of
America, 1995
• Deborah and Franklin Tepper Haimo Award for Distinguished
College or University Teaching of Mathematics, the Mathematical
Association of America, January, 1996
• Named to the Thomas A. Scott Chair in Mathematics,
University of Pennsylvania, January, 1998.
• The Leroy P. Steele Prize of the American Mathematical
Society, for Seminal Contribution to Research (jointly
with Doron Zeilberger), January, 1998
• The Euler Medal of the Institute for Combinatorics
and its Applications (Canada), March, 2004.
