The first biography of America's greatest twentieth-century sculptor, Alexander Calder: an authoritative and revelatory achievement, based on a wealth of letters and papers never before available, and written by one of our most renowned art critics. Alexander Calder is one of the most beloved and widely admired artists of the twentieth century. Anybody who has ever set foot in a museum knows him as the inventor of the mobile, America's unique contribution to modern art. But only now, forty years after the artist's death, is the full story of his life being told in this biography, which is based on unprecedented access to Calder's letters and papers as well as scores of interviews. Jed Perl shows us why Calder was--and remains--a barrier breaker, an avant-garde artist with mass appeal. This beautifully written, deeply researched book opens with Calder's wonderfully peripatetic upbringing in Philadelphia, California, and New York. Born in 1898 into a family of artists--his father was a well-known sculptor, his mother a painter and a pioneering feminist--Calder went on as an adult to forge important friendships with a who's who of twentieth-century artists, including Joan Miró, Marcel Duchamp, Georges Braque, and Piet Mondrian. We move through Calder's early years studying engineering to his first artistic triumphs in Paris in the late 1920s, and to his emergence as a leader in the international abstract avant-garde.