Alexander Calder, whose illustrious career spanned much of the twentieth century, is one of the most acclaimed and influential sculptors of our time. Born in a family of celebrated, though more classically trained artists, Calder utilized his innovative genius to profoundly change the course of modern art. In the 1920s, he began by developing a new method of sculpting: by bending and twisting wire, he essentially “drew” three-dimensional figures in space. He is renowned for the invention of the mobile, whose suspended, abstract elements move and balance in changing harmony. From the 1950s onward, Calder devoted himself to making outdoor sculpture on a grand scale from bolted sheet steel. Today, these stately titans grace public plazas in cities throughout the world.