Mark Rexford Sutherland was born in Orange, California, the third of four boys. In the early fifties his family moved north to Los Angeles. According to Disney press releases, he had worked with his two older brothers in a dance act, and had appeared on episodes of Ford Television Theater, Make Room for Daddy, and in films prior to auditioning for the show. He wanted to be a disc jockey when he grew up; his hobbies were Little League baseball (he played catcher), football, swimming, and horseback riding.
Mark was a fair dancer, and could sing well enough in groups, but outside of a Talent Roundup Day spot never did a solo performance that I
can recall. He did seem to have a problem maintaining focus on-camera, possibly due to light sensitivity. The powerful arc lights that shone
in the performers faces seemed to trigger a reaction in Mark, who can often be seen blinking and looking away from the camera.
One of the first sequences filmed for the show in May 1955 was the Talent Round-Up introductory song and dance. For some reason Mark wound
up in this instead of Lonnie Burr, who appeared in Roll Call the other four days of the week. Because the Roll Call
segments were only filmed once (unlike the Alma Mater), Mark thus appeared every Friday with the Red Team throughout the show's first season.
Later on, Mark's regular assignment was the Blue Team, for Guest Star Day and Circus Day.
Mark himself was a Talent Round-Up Day winner as a disc jockey, dishing up the palaver in between songs by Darlene Gillespie
. He also took his turn doing the Mousekartoon song and showing off the Mouseka-treasures won by Talent Roundup winners (curiously enough this appeared to all be Disney-licensed merchandise).
Like the other Mouseketeers, Mark probably took part in the Disneyland Circus. This started after the first season filming wrapped up in early November 1955, and continued through early January 1956. At that point the majority of Mouseketeers, including Mark, were let go as their contract options expired.
Little has been made public about Mark's post-Mickey Mouse Club life. He didn't continue in show business, and for many years his whereabouts were unknown to the Disney Studio and the Screen Actors Guild. He did contact the studio just before the televised 25th Anniversary Show in 1980, but declined to take part. He is the only original Mouseketeer to have neither participated in post-show activities, nor to have provided a public update on his life and career.
Coincidently, Disney Radio hired a young disc jockey called "Just Plain Mark" in the 1990's, who was also named Mark Sutherland.