What a shock. He was a great, great actor, whose career spanned from the 1950s to today, as well as a writer, director and producer. I remember him saying of his role in the Harry Potter movies that he HAD to take the role because his granddaughter said she would never speak to him if he didn't, and he couldn't take that chance.
Here is a link to his filmography. http://us.imdb.com/Name?Harris,+Richard