David Nkrumah Liebe Unger Hart also credited as D L Hart born April 19 1957 is an American outsider musician puppeteer and actor He is best known for his appearances on Adult Swims Tim and Eric Awesome Show Great Job performing bizarre puppetry and singing in a variety of voice characterizations He is also known in the Los Angeles area for his role as a puppeteer on The Junior Christian Teaching Bible Lesson Program a local publicaccess television cable TV program as well as for performing with his puppet Doug the Dog just outside the Hollywood Bowl and Los Angeles Music Center after shows where he is known to many concert goers simply as the puppet man He has also been known at times as David Hart David Lieber Mintz David Unger Hart David King Liebe Hart and DL Hart