John Gorrie
From Tardis Wiki, the free Doctor Who reference
John Gorrie (born 11 August 1932) directed the Doctor Who story The Keys of Marinus.
He may also have directed, without on-screen credit, the third episode of the Doctor Who story The Reign of Terror, "A Change of Identity" when Henric Hirsch was taken ill during recording.
However, Gorrie claimed in later years to have no memory of working on The Reign of Terror, so it is possible that the director of "A Change of Identity" may actually have been someone else, whose identity remains unknown to this day.
