Sarah Howgate is Contemporary Curator at the National Portrait Gallery. Barbara Stern Shapiro is Curator for Special Projects at the Museum of Fine Arts. Mark Glazebrook is a writer and curator and organized David Hockney's first retrospective in 1970. Edmund White is professor of the Council of the Humanities and Creative Writing at Princeton University and the award-winning author of many books, including "A Boy's Own Story" and "Genet: A Biography. "Marco Livingstone is an art critic, curator, and author of "Hockney's People,"