Carnival in Rio de Janeiro, 1970
Photo by Peter Albrecht
Visit to Cornell University, Winter 1973-1974
Photo by Terry Fine
IBM Research Magazine, 1987
Photo by Alan Haywood
IBM 25th Anniversary Lunch, 1992
Photographer unknown
Author Photo, Various Books, 2002
Photo by Jacquie Meyer
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Artist's Interpretation, Valparaiso, 2007
Drawing by Marco Roblin
Lecturing in Estonia, 2003
Photo by Vahur Kotkas
With Stephen Wolfram and Paul Davies, 60th Birthday Party, Burlington, 2007
Photo by Hector Zenil
With Ursula Molter and Hernán Lombardi opening the Buenos Aires Mathematics Festival, 2009
Photographer unknown
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