Shiing-Shen Chern
For example, in 1962 the meeting was dominated by talks on K-theory, at that time the breaking news. The early participants included Jean-Pierre Serre, Jacques Tits, Alexander Grothendieck, Hans Grauert, Nicolaas Kuiper, Raoul Bott, John Milnor, Stephen Smale, Armand Borel, Shiing-Shen Chern, Kunihiko Kodaira, Donald Spencer, Michael Atiyah, Isadore Singer, Shreeram Shankar Abhyankar, Michel Kervaire, Karl Stein, Reinhold Remmert, René Thom, Serge Lang and Frank Adams.