Robert Porter McKimson, Sr. (October 13, 1910 – September 29, 1977) was an American animator and illustrator, best known for his work on the Looney Tunes and Merrie Melodies series of cartoons from Warner Bros., and later DePatie-Freleng Enterprises. He was also well known for defining Bugs Bunny's look in the 1943 short Tortoise Wins by a Hare. Wikipedia