Born and raised in Vancouver, Canada, Don moved to Toronto while he was a youth.
He started his acting career at the age of 11 and soon moved on to play on and off Broadway. Between his work on stage and his soon beginning career in television, he also made music and appeared in a lot of different radio shows.
He landed his first big role in television in 1966 in NBC's Jericho. After that he did win win ACTRA Award for Best Dramatic Performance twice in a row in 1980 and 1981.
In 1997 his latest famous acting role came - he played technic-nerd Walter in La Femme Nikita