Mathews was born in Melbourne, and met Davies at the University of Oxford. Sharing an interest in theatre, they became engaged at the Old Vic in 1939 and married in 1940. Returning to Canada, they settled in Peterborough, Ontario, and had three daughters. Brenda gave up her career in the theatre.
After Davies' death in 1995, she and one of their daughters, Jennifer Surridge, became literary executors for his estate, and formed the company Pendragon Ink for this purpose. Together they edited one volume of Davies' criticism.
- Davies, Robertson, Happy Alchemy (1997) (edited by Jennifer Surridge and Brenda Davies)
- Globe and Mail obituary
- Martin Chilton (2 December 2015). "Robertson Davies: Canada's greatest novelist?". The Telegraph. Retrieved 13 December 2018.
- Jim Coyle (21 June 2013). "From Robertson Davies, with love". Toronto Star. Retrieved 13 December 2018.
- Noreen Shanahan (7 February 2013). "Robertson Davies' mate and manager". The Globe & Mail. Retrieved 13 December 2018.
- Graeme Skinner, "Pete and Tass: Sculthorpe and Drysdale", ABC Radio 24 Hours, August 1997, p. 34