Her long partnership with playwright Justin Tanner resulted in the long-running, late-night show Zombie Attack!, among other plays. Actors who appeared at the Cast included Mark Ruffalo and French Stewart.
She earned a master's degree in painting and drama from USC. She began her career in the late '70s as a playwright, producing a rock musical version of Cinderella, among others. She did not meet with much success, however.
She was hired as literary manager of Cast Theatres in 1984. In 1990, she rose to the position of artistic director. She left the theatre after a disagreement with Tanner, whose plays were a mainstay at Cast, according to the L.A. Times.
"We did not speak for 15 years," Tanner told the paper. "The damage we did in the volatile [final] period at the theater was scorched earth. I’ve never been as brutal, and never been treated as brutally."
Soon after, Ms. Gibson joined the Fountain. In recent years, she lived in an apartment above the theatre.