RIP he was a good one.. Thad Mumford, a pioneering African-American writer and producer on series including M*A*S*H, The Cosby Show, Maudeand ALF, has died. He was 67. Mumford died Sept. 6 in Silver Spring, Maryland, his cousin John Sims announced. A cause of death was not reported. Mumford, who won an Emmy in 1973 for outstanding achievement in children's programming for his work on The Electric Company and was nominated three other times, also wrote for an array of other programs, including Good Times, Roots: The Next Generation, The Cosby Show, Coach, Sesame Street, Clarissa Explains It All, Home Improvement, NYPD Blue and Blue's Clues.