He was born James Lancaster in Toronto, Ontario, where, as a boy, he won singing contests at school, allowing him to perform with Toronto's Opera Festival Association. He pursued the arts as a career, changing his name to Heath Lamberts, and in 1963 graduated from the National Theatre School of Canada in Montreal. He worked extensively in theatres across Canada, especially at the Shaw Festival and the Stratford Festival. He also studied mime in Paris, France at Le Coq d'Or. On Broadway his longest role was in the original cast of Beauty and the Beast on Broadway as Cogsworth. He had roles in dozens of television movies and shows and played numerous roles in Pittsburgh theatre.
He was a Member of the Order of Canada, inducted in 1987.
Lamberts died in Pittsburgh, Pennsylvania, USA on February 22, 2005 from cancer.