Crystal Walker (born October 13, 1962), better known by her stage name T'Keyah Crystal Keymáh, is an American actress, writer, director, producer, singer, and comedian who is best known for being a cast member on the Fox Network sketch comedy television series, In Living Color (1991-1994), matriarch Tanya Baxter on the Disney Channel sitcom That's So Raven and voiced Mrs. Carter and Marsha Brubert on the Disney Channel animated series American Dragon: Jake Long.