Born, 18 June 1938, Aberdeen
Died, August 31st, 2005, Isle of Wight

Michael Sheard had six separate appearances in Doctor Who alongside five different Doctor's.

The Ark : Rhos
Castrovalva : Mergrave
The Invisible Enemy : Lowe
The Mind of Evil : Dr. Summers
Pyramids of Mars : Laurence Scarman
Remembrance of the Daleks : Headmaster

He was later better known as Mr Bronson in Grange Hill, but Doctor Who fans will always associate him with their series.