Lawrence began his career in Hollywood in the late 1980s with supporting TV and film appearances. He debuted as a perpetrator defended by James Earl Jones in LA Law. He had a recurring role on Murphy Brown and in the early 1990s was a semi-regular on the Whoopi Goldberg series Bagdad Cafe.
In film, his first appearance was in the 1990 thriller The First Power with Lou Diamond Phillips. He next appeared in the Drew Barrymore 1993 horror film Doppelganger. Other credits include the Jean-Claude Van Damme vehicle Timecop and Howard Stern's Private Parts.
From 1994 to 2006, Lawrence voiced Darth Vader in the Star Wars video game series produced by LucasArts. After his performance in Star Wars: Empire at War, he was succeeded by Matt Sloan. Lawrence returned to the role in the game Star Wars Jedi: Fallen Order in 2019.