Gregory Walter Graffin, PhD. (born November 6, 1964 in Racine, Wisconsin) is the vocalist and co-founder of the punk rock band Bad Religion, as well as a life sciences professor at UCLA.

Dr. Gregory Walter Graffin (born November 6, 1964 in Racine, Wisconsin), better known as Greg Graffin, is the vocalist and co-founder of the punk rock band Bad Religion . He attended El Camino Real High School. In 1980, at age 15, Graffin and a few high school classmates formed Bad Religion in Southern California’s San Fernando Valley. After making a name for themselves in the Los Angeles punk scene, releasing three EPs and two full-length albums, they disbanded in 1984. However, the band re-f