He changed his name from Christopher Martin to Martin Christopher so as not to be confused with another Christopher Martin from the hip hop duo Kid 'n Play.
He is 6'1".
Martin Christopher: (On getting the role of Major Marks in Stargate) I believe I had an audition for a technician aboard the Prometheus. It turned out to be a small part that was in Avalon I and II. Somehow Marks got promoted to the bridge and the rest is history. The Audition was quite quick. Andy and Robert were in the room, both very friendly. All I remember was Robert asking if I'd cut my hair. I like growing it long…what a bum. Other than that it was like any other audition.