
Acting
Gregory Walter Graffin (born November 6, 1964) is an American singer who is the lead vocalist and only constant member of the punk band Bad Religion, which he co-founded in 1980. He has also released three solo albums.
Graffin obtained his PhD in zoology at Cornell University and has lectured courses in natural sciences at both the University of California, Los Angeles and at Cornell University.
Description above from the Wikipedia article Greg Graffin, licensed under CC-BY-SA, full list of contributors on Wikipedia.

Punk in Drublic Documentary
as Self

DIESEL
as Self

Fading West
as Self

Filmage: The Story of Descendents/All
as Self

Die Toten Hosen - Rock am Ring
as Vocals

One Nine Nine Four
as Himself

Bad Religion: New Maps of Hell

Bad Religion live at Rockpalast

The Best of Flipside Video Vol. 1
as Himself (as Bad Religion)

Punk Rock Summer Camp
as Himself