Leo Castelli reigned for decades as America’s most influential art dealer. Now Annie Cohen-Solal, author of the hugely acclaimed Sartre: A Life recounts his incalculably influential and astonishing life in Leo and His Circle (Knopf, $35). After emigrating to New York in 1941, Castelli would not open a gallery for sixteen years, when he had reached the age of fifty. But as the first to exhibit the then-unknown Jasper Johns, Castelli emerged as a tastemaker overnight and fast came to champion a virtual Who’s Who of twentieth-century masters: Rauschenberg, Lichtenstein, Warhol, and Twombly, to name a few. Leo and His Circle brilliantly narrates the course of one man’s power and influence. But Castelli had another secret, too: his life as an Italian Jew. Annie Cohen-Solal traces a family whose fortunes rose and fell for centuries before the Castellis fled European fascism. Drawing on her friendship with the subject, as well as an uncanny knack for archival excavation, Annie Cohen-Solal gives us in full the elegant, shrewd, irresistible, and enigmatic figure at the very center of postwar American art, bringing an utterly new understanding of its evolution. 6pm