He has voiced the character Uncle Ruckus on The Boondocks, General Horace Warfield in StarCraft II: Wings of Liberty and Dr. Richard Tygan in XCOM 2, portraying Anton "Bebop" Zeck in Teenage Mutant Ninja Turtles: Out of the Shadows.

Born in Fayetteville, Georgia,[2] 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.

[6] Williams' early roles include Abe Kenarban (Stevie's dad) in the Fox TV sitcom Malcolm in the Middle[7] and as Judge Trudy's Bailiff on Nickelodeon's The Amanda Show.

[10] Williams plays parts in five different shows on Cartoon Network's late night programming block, Adult Swim, one being a STRATA technician on Saul of the Molemen, another as the self-hating African American, Uncle Ruckus on The Boondocks,[2] Coroner Rick, a recurring character on Stroker and Hoop, he also played the role of Paul Revere on the television special, The Young Person's Guide to History, and served as the voice-over announcer for The Eric Andre Show until 2013.

Since 2013, Williams has been a replacement performer on the CW revival of the television show Whose Line Is It Anyway?, where he improvises scenes and songs.

In November 2021, it was announced that Williams would be voicing the character, Beta, in the animated comedy-adventure series, Hailey's On It!, which premiered on June 8, 2023.

He also played Melvin in House Party: Tonight's the Night and Anton Zeck / Bebop in Teenage Mutant Ninja Turtles: Out of the Shadows.

[16] He performs in the improvisational shows Cookin' With Gas and The Black Version at The Groundlings Theatre in Los Angeles.

Williams provided the voices for the characters of Yancy Westridge in Alpha Protocol, Elanos Haliat in Mass Effect and Horace Warfield in StarCraft II: Wings of Liberty and Heart of the Swarm.