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
[Click on photo for higher resolution]
Artist's Interpretation, Valparaiso, 2007
Lecturing in Estonia, 2003
Photo by Vahur Kotkas
With Stephen Wolfram and Paul Davies, Burlington, 2007
Photo by Hector Zenil
