David Nkrumah Liebe Unger Hart, also credited as D. L. Hart, (born April 19, 1957) is an American outsider musician, painter, puppeteer and actor. He is best known for his appearances on Adult Swim's 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 public-access 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.
During an interview with Jimmy Kimmel, David stated he first developed his passion for puppeteering upon attending church Sunday school in his youth. He claims to have gotten his start in Hollywood performing with comedian Robin Williams and from making an appearance on The Gong Show in 1977. In 1990 he appeared on Golden Girls and in 1993 on Wings.
Hart has frequently appeared on television shows The Del Talk Show, Tim and Eric Awesome Show, Great Job! as well as various other Abso Lutely productions and independent films. In 2004, David Hart was featured in the documentary Public Access Hollywood. He made an appearance on The Daily Show with Jon Stewart in 2004 and again 2009, as well as on Jimmy Kimmel Live! in 2004. He also appeared in a commentary on Tim And Eric Awesome Show, Great Job! Season One DVD. Throughout late April and early May 2008 he performed live as part of Tim and Eric's Awesome Tour 2008. In 2014 Hart appeared prominently in the independent feature film White Cop. In 2018, Hart appeared in the crowd sourced remake of Shrek, Shrek Retold, in which he performs the song Hallelujah, originally composed by Leonard Cohen.