Michael John Nelson (born October 11, 1964) is an American comedian and writer, most known for his work on the television series Mystery Science Theater 3000 (MST3K). Nelson was the head writer of the series for most of the show's original eleven-year run, and spent half of that time as the on-air host, also named Mike Nelson. In addition to writing books, Nelson is currently part of the online movie riffing site RiffTrax, and was previously part of the straight-to-DVD Film Crew with fellow MST3K alumni, Bill Corbett and Kevin Murphy.