High Quality Content by WIKIPEDIA articles! Robert "Bob" Porter McKimson, Sr. (October 13, 1910 – September 29, 1977) was an American animator, illustrator, and director 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 1943.