Janet Bishop is Curator of painting and sculpture at the San Francisco Museum of Modern Art. Michael Auping is Chief Curator at the Modern Art Museum of Fort Worth. He is the author of "Abstract Expressionism: The Critical Developments "(1987), "Clyfford Still (1904-1980): The Buffalo and San Francisco Collections "(1992), and "Arshile Gorky: The Breakthrough Years "(1995). Jonathan Weinberg is an art historian and painter. He is the author of "Ambition and Love in Modern American Art "(2001) and "Speaking for Vice: Homosexuality in the Art of Charles Demuth, Marsden Hartley, and the First Ame...