Walter Edward Hart Massey (August 19, 1928 – August 4, 2014) was a Canadian actor, best known for voicing Principal Herbert Haney on the animated series Arthur and The Doctor in the English version of The Mysterious Cities of Gold. He was based in Montreal, Quebec. He played Dr. Donald Stewart on the 1990s version of Lassie, and had numerous roles on stage, and in films and television, for more than six decades. Massey was the cousin of actor Raymond Massey and was a founding member of Canadian Actors' Equity. Walter Massey's father, Denton, was an engineer and Ontario politician.