John Allen Amos Jr. is an American actor known for his role as James Evans, Sr. on the CBS television series Good Times and for the 1977 miniseries Roots, for which he received an Emmy nomination. Amos's other television work includes The Mary Tyler Moore Show, a recurring role as Admiral Percy Fitzwallace on The West Wing, and the role of Washington, D.C. Mayor Ethan Baker in the series The District. Amos has appeared on Broadway and in numerous films in his four-decade career. He has been nominated for a Primetime Emmy Award and an NAACP Image Award. On film, he has played numerous supporting roles in movies such as The Beastmaster, Coming to America and Die Hard 2.