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.