He was one of the original three animators ( along with David Silverman and Bill Kopp ) on The Simpsons ' , Tracey Ullman shorts , and subsequently directed a number of `` The Simpsons '' episodes ( many of which had John Swartzwelder as an episode writer ) before becoming supervising director at `` King of the Hill . ''
He was one of the original three animators ( along with David Silverman and Bill Kopp ) on The Simpsons ' Tracey Ullman shorts and subsequently directed a number of Simpsons episodes before becoming supervising director at `` King of the Hill '' for many years .