James Carter Walker Jr. (born June 25, 1947), known professionally as Jimmie Walker, is an American actor and comedian. Walker is best known for portraying James Evans Jr. (J. J.), the oldest son of Florida and James Evans Sr. on the CBS television series Good Times which originally ran from 1974–1979. Walker was nominated for Golden Globe awards Best Supporting Actor In A Television Series in 1975 and 1976 for his role. While on the show, Walker's character was known for the catchphrase "Dy-no-mite!" which he also used in his mid–1970s TV commercial for a Panasonic line of cassette and 8-track tape players. He also starred in Let's Do It Again with John Amos, and The Greatest Thing That Almost Happened with James Earl Jones. Walker continues to tour the country with his stand-up comedy routine.