Gregory Walter Graffin, Ph.D is an American punk rock singer-songwriter, multi-instrumentalist, college lecturer, and author. He is most recognized as the lead vocalist, songwriter, and only constant member of the noted Los Angeles band Bad Religion, which he co-founded in 1980. He also embarked on a solo career in 1997, when he released the album American Lesion. His follow-up album, Cold as the Clay was released nine years later. Graffin obtained his PhD in the history of science at Cornell University and has lectured courses in natural sciences at both the University of California, Los Angeles and at Cornell University.