He also acted in another production in the same year at Fullerton College called Red Noses, a black comedy produced by Peter Barnes and directed by Michael Fields.

[3] Williams has appeared on many TV series since 1994, including Star Trek: Deep Space Nine, Beverly Hills, 90210, NYPD Blue, Lois & Clark: The New Adventures of Superman, JAG, Living Single, Nash Bridges, Providence, Law & Order: Special Victims Unit, Veronica Mars, The West Wing, Close to Home, ER, and Grey's Anatomy.

He was the fifth cast member in the original pilot for Will & Grace, playing Will's law firm partner, but was dropped during rehearsals because director Jim Burrows said they didn't need his character.

From 2018 to 2021, he has ventured back into adaptations of DC Comics: As main character Jefferson Pierce / Black Lightning on The CW's superhero TV series Black Lightning, which was integrated into Arrowverse's prime Earth during Crisis on Infinite Earths, and as John Henry Irons in the animated film The Death of Superman and its 2019 sequel, Reign of the Supermen.

After his Black Lightning series concluded, he reprised the role on The Flash at the start of its eighth season as part of its "Armageddon" event.