Osvald Timmas was born in 1913 in the County of Kärla, Saaremaa, Estonia. He studied economics at the University of Tartu from 1939 to 1944. Then he studied art with prominent artists Nikolai Kummits in Tartu from 1939 to 1942 and Günther Reindorff in Tallinn from 1943 to 1944. Followed by studies in Illustrative Arts in Stockholm, Sweden, from 1947 to 1950.
In 1951 Timmas moved to Canada, he established himself as a professional artist, and became a Canadian Citizen in 1956.
Timmas’s works in watercolour, oil and acrylic paintings. He pioneered his own watercolour technique using ferric oxide, a more permanent pigment producing bold and bright colours
He was an instructor and lecturer throughout his career. He was a member of The Royal Canadian Academy.
Timmas passed away on October 27, 2005 in Toronto, Ontario, Canada.