Alexander Calder was a mobile creator, best known for his abstract sculptures. He was born in 1898 and is considered to be one of the most influential American sculptors of the 20th century. His mobiles, which are kinetic sculptures made of wire and metal, are some of his most famous works. He was also a painter and an innovator in the field of kinetic art. He died in 1976, leaving behind a legacy of modern art that continues to inspire artists today.