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.

[3] During an interview with Jimmy Kimmel, he stated he first developed his passion for puppeteering upon attending church Sunday school in his youth.

[citation needed] 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.

Since 2014, Hart has been collaborating and performing with producer/composer Jonah Mociun (AKA Th' Mole), developing a more electronic-oriented and carefully sculpted sound.

David Hart has been known to sell an album titled Christian Hymns And Songs Of Praise[12] at shows during the Tim and Eric Awesome Tours in 2008 and 2009.

In Spring 2011, Hart and Papagan toured the East and West Coast with a newly formed band that played punk music exclusively, including new interpretations of their older material.