Alfred Tarski
Oskar Morgenstern and Kurt Gödel
Patras Logic Symposion 1980
Left to Right: Peter Aczel, Sol Feferman, Robin Gandy, John and Margaret
Shepherdson, Gert Müller
Gödel-Symposium in Salzburg, July 1983
From Left to Right in the foreground: Stephen Kleene, John Dawson, Sol
Feferman, Michael Beeson, Georg Kreisel (half turned), Karl Popper, Azriel
Levy (turned), Dana Scott, Charles Parsons (half turned).
Dana Scott and Anita Burdman Feferman
With Willard Van Orman Quine in Boston, Aug. 1998 (for 20th World Congress
of Philosophy)