Williams was born in Fayetteville, Georgia. Prior to moving to Los Angeles in 1998, Williams was involved in theater, comedy and television in Atlanta, where his credits include acting with the Georgia Shakespeare Festival, performing and writing for Agatha's: A Taste of Mystery and being a longtime member of Atlanta’s longest running improv troupe, Laughing Matters. Williams had recurring roles in the television series I'll Fly Away and In the Heat of the Night, both filmed in the Atlanta area. 
Williams' past roles include Abraham Kenarban (Stevie's dad) in the Fox TV sitcom Malcolm in the Middle and as Judge Trudy's Bailiff on Nickelodeon's The Amanda Show. Williams was a series regular on the WB Television Network sketch comedy series, Blue Collar TV. One of his most iconic roles in his career is playing Uncle Ruckus (no relation) from the Boondocks  He also is a reoccurring comedian on The CW revival of Who's Line is it Anyways?.
- Williams is the only voice actor to voice Mufasa since James Earl Jones.