Animator, cartoonist and composer, most known for his work on the Mickey Mouse segments, Night on Bald Mountain and Ave Maria, from Disney's Fantasia.
He was fascinated with art as a child, and often spent his days sketching and illustrating rather than socializing with others.
Walt Disney lauded him as one of the best composers and animators on the Disney roster.
He was brought up in Chicago, Illinois.
He was instrumental in the creation of Disney's Fantasia, which inspired Maurice Sendak to become an illustrator and designer.