Jimmie “ Dynomite” Walker (born June 25, 1947) is an American actor and stand-up comedian, best known for portraying J.J. Evans on the television series “Good Times,” which ran from 1974 to 1979. While on the show, Walker’s character was known for the catch phrase, “Dy-no-mite!” which he also used in his mid-1970s TV commercial for a Panasonic line of cassette and 8-track tape players.

Walker was born in The Bronx, New York. He is a graduate of Theodore Roosevelt High School, in New York City. Through a federal program known as SEEK, or “Search for Education, Evaluation, and Knowledge,” he continued his studies and entered into the field of radio engineering with WRVR. As a young man, Walker was a vendor at Yankee Stadium, starting with the 1964 World Series. He was given a Silver dollar by Mickey Mantle that he still owns. Walker was very friendly with Gary Cohen, who went on to be operations manager at Yankee Stadium. In 1967, Walker began working fulltime with WRVR, the radio station of the Riverside Church. Walker married Jere Fields in 1980.