Played Rear Admiral A. J. Chegwidden on the CBS show JAG, which ran from 1995 to 2005.
He attended The University of Texas at Austin, then became a social studies teacher.
He was asked to use his middle name, M, because their was already an actor named John Jackson.
He married Jana Gale Hawkins Jackson, and has a son who is a professional baseball player.
He played an AC-130 pilot on the show Knight Rider alongside David Hasselhoff.