What was the reasoning behind the rename? He was never credited as "Michael John".
Talk about it here.
Michaeljohn Harris (1925-2008) was the visual effects designer on several Doctor Who television stories — though he was credited under slight variations of the title on his earliest serials. He was also one of the uncredited visual effects personnel on The Tenth Planet. (INFO: The Tenth Planet)
- The Evil of the Daleks (with Peter Day)
- The Tomb of the Cybermen (with Peter Day)
- The War Games
- Terror of the Autons
- The Time Monster
- The Three Doctors
- The Talons of Weng-Chiang
- Internet Movie Database at the