Jackson Pollock, Willem de Kooning, Franz Kline, and Mark Rothko. Others included Joan Mitchell, Hans Hofmann, Clyfford Still, Philip Guston, Helen Frankenthaler, Barnett Newman, Adolph Gottlieb, Robert Motherwell, Lee Krasner, Bradley Walker Tomlin, William Baziotes, Ad Reinhardt, Richard Pousette-Dart, Elaine de Kooning, Alfred Leslie and Jack Tworkov.