Thomas Gilbert Brian Caunt was born in Hull, Yorkshire, England to Harry Caunt and Louisa (Cuthbert) Caunt in 1898. In 1903, he came to Canada with his family who settled in Winnipeg, Manitoba. Caunt originally wanted to be a farmer and attended the Manitoba Agricultural College (later University of Manitoba) in 1914 and 1915.

In 1915, Caunt joined the 8th Battalion of the Winnipeg Rifles and was posted overseas with the 1st Division CEF, and served as infantry during The Somme, Ypres, and Passchendaele. He returned to Canada in late 1919. Caunt was a member of the Canadian Legion Post 2 for many years.

After serving in the war, he was determined to become a doctor. He graduated in medicine from the University of Manitoba in 1934. Caunt married Lucy Agnes Sybil Slaughter on April 24, 1935.

Following an internship at the Vancouver General Hospital, Caunt joined the staff of the Provincial Mental Hospital, Essondale in 1935. For many years he was in charge of the care of Veterans at the hospital. In 1952, he became medical superintendent of the hospital and Crease Clinic, a position he held until 1963 when he retired.

In 1954, Caunt became a Fellow of the American Psychiatric Association as well as a certified specialist in psychiatry by the Royal College. He was also a charter member of the Canadian Psychiatric Association.

Caunt died on January 28, 1984.