Gregory Alan Williams (born June 12, 1956) sometimes credited as Gregalan Williams, is an American actor and author. He is best 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 in 2017's Manhunt: Unabomber, and from 2019 to 2025 The Righteous Gemstones.