[1] He is known for playing the role of Dalton Humphrey in the Canadian comedy series The Red Green Show, and appearances on History Bites.

[2][3] Bainborough had originally registered to begin pre-med, but switched majors and earned a degree in the Fine Arts from the University of Alberta in Edmonton.

He began working in regional theatre,[4] until he co-wrote and performed in Paper Wheat with the 25th Street House Players in Saskatoon, Saskatchewan in 1973.

[7] In 1987, he won the Dora Mavor Moore Award for Outstanding New Revue or Musical,[4] and in 1990, he directed for the Mainstage Wing of the Second City Company.

[9] In 2015, Bainborough appeared as shop owner Maynard Oltorf in two episodes of the FX (TV channel) series Fargo.