Williams' film credits include the newly released Block Party, Teenage Mutant Ninja Turtles: Out of the Shadows, The Internship, Harold & Kumar Go to White Castle, Undercover Brother, Soul Plane and The Factory.

On television, Williams recently starred in the sitcom The Crew, Reno 911! The Hunt for QAnon, and as Santa in the Disney Channel Original Movie Christmas Again. His additional television credits include I'm Sorry, Boston Legal, Blue Collar TV, The Neighborhood, How I Met Your Mother, Whose Line is it Anyway?, The Soul Man, Raising Hope, Malcolm in the Middle and Weeds. He is also the voice of the award-winning music show Unsung.

An accomplished voice actor, Williams is best known for voicing Uncle Ruckus on The Boondocks. His additional voiceover credits include Disney Channel's Marvel's Moon Girl and Devil Dinosaur, based on Marvel's hit comic books, Oddballs, Hailey’s On it, The Lion Guard, Star Wars Resistance, Star vs. The Forces of Evil, Puppy Dog Pals, Love, Death & Robots, Star Wars: The Clone Wars, Batman: The Brave and the Bold, Bob's Burgers, Rick and Morty, Family Guy, American Dad! and Rugrats.

Gary and his writing partner wrote a comedy feature for Lionsgate. In addition, they are creators of the DreamworksTV show; Life Hacks For Kids and the NBC/Universal TV show Life Hacks For Kids on the Road. Gary also wrote and directed the animated short, Baby Stache, for Nickelodeon.

He is also a proud member of the all-black improv show, The Black Version. Born in Fayetteville, Georgia, Williams currently resides in Los Angeles.