Alexander Calder was an American artist known for creating moving mobiles and sculptures made of wire. Some of his most famous works included large outdoor sculptures like "Flamingo" in Chicago and "L'Homme" in France, which measures over 20 meters tall. Calder was also an inventor who pioneered kinetic sculptures that moved through motors or air currents, like his mobile "Red Lily Pads" displayed at the Guggenheim Museum.