Robert Sinclair was born in Saltcoats, Saskatchewan in 1939. He received his Bachelor of Fine Arts from the University of Manitoba and a Master of Arts and Master of Fine Arts degrees from the State University of Iowa.
Sinclair taught art at the University of Alberta from 1965 to 1996. He also taught art at the Banff School of Fine Arts, and the Red Deer College Summer Series Program during the 1980's. Sinclair also runs his own watercolour workshops.
He is a member of the Royal Canadian Academy of Arts and the Canadian Society of Painters in Watercolour.
Sinclair is also a teacher of tai chi and has practiced Buddhist meditation for many years.
He has exhibited regularly in Canada since 1972. He is represented in many corporate and public collections across Canada, America, Europe and Japan.