Moore is best known for being the resident specialist in the animation of Mickey Mouse. He is most notable for redesigning the character in 1938 for his landmark role as The Sorcerer's Apprentice in Fantasia, a look which remains Mickey's official look to this day. His animation of the earlier Mickey design was especially memorable in the 1938 short The Brave Little Tailor, the last significant appearance of the "pie-eyed" Mickey.