Worked as the original warm-up comedian for Saturday Night Live in 1975, and appeared in several early episodes
Appears briefly in the 1980 film Fame
Had roles in two Spike Lee movies, Get on the Bus and Girl 6
An avid conspiracy theorist, authored 1999's UFOs, JFK and Elvis: Conspiracies You Don't Have to Be Crazy to Believe
His best-known character, Det
John Munch, has made an appearance on more than six different series, including Homicide: Life on the Street, three Law & Order franchises, The X-Files and UPN's short-lived The Beat