Gregory Alan Williams (born June 12, 1956 Des Moines, Iowa, USA) is an American actor and author. He is known for portraying LAPD Officer Garner Ellerbee in Baywatch. From 2011 until 2013, Williams portrayed the role of Coach Pat Purnell in the USA Network series Necessary Roughness. Williams also appeared on the 2015 ABC series Secrets and Lies and then on Greenleaf, and later on 2017's Manhunt: Unabomber.
In addition to acting, Williams has authored four books including A Gathering of Heroes: Reflections on Rage and Responsibility: A Memoir of the Los Angeles Riots. The book chronicles Williams' life and experiences with racism, along with an incident during the 1992 Los Angeles riots in which Williams saved the life of a Japanese American man who was being beaten by rioters.
