Gregory Alan Williams (born June 12, 1956) is an American actor and author who performed the voice of the Dr. Victor Monroe.
Williams played Garner Ellerbee on Baywatch; Season 1, Season 3 to Season 5 as a recurring supporting cast role in Season 2 and Season 8 and a regular cast in the spin-off Baywatch Nights.
He is currently playing Robert "Mac" MacCready in the American drama Greenleaf and is also playing a role in a detective movie called The B Team along with other Baywatch cast members Jeremy Jackson, David Chokachi, Jaason Simmons, Michael Bergin, Alexandra Paul and Kelly Packard.
In his early years, Williams had enlisted in the U.S. Marine Corps, and was featured in a brouchure about Marines who had excelled in civilian life.