- Township: Embro & West Zorra
- Rank: Captain
- Branch: Canadian Over-Seas Expeditionary Force, Medical Corps
- Date of birth: February 28,1890
- Where born: Embro, West Zorra Township, Oxford County, Ontario, Canada
- Wars Served: World War I
- Years of service: February 13, 1917 -
- Country enlisted with: Canada
Angus MacKay was born February 28, 1890, son of Thomas and Annie (nee McDonald) MacKay of Lot 22, Concession 6. He received his early education at local schools in West Zorra Township, then at Woodstock Collegiate, and graduated in medicine from the University of Toronto in 1917. At the time of his enlistment in WW 1, he was living in Woodstock, where he was a doctor. He was also Presbyterian. Given the rank of captain, Dr. MacKay served in the Medical Corps with the Canadian Expeditionary Over-Seas Force. After post-graduate work in London, England hospitals he returned to Toronto, Canada and was appointed to the staff of the old Grace Hospital. With the amalgamation of Grace Hospital with the Western Hospital he received an appointment on the combined staff, medical department which was associated with the teaching staff of the University of Toronto. Dr. MacKay was a classmate and good friend of Sir Frederick Banting, the discoverer of insulin.
Specializing in insulin. Dr. MacKay was a frequent lecturer on treatment for diabetes before medical societies and a contributor to medical literature on the subject. He was a member of the Academy of Medicine, Toronto; the Fellowship of the American College of Physicians; the Caduceus Club; Islington Golf Cub; and Masonic Order, I.O.F and O.O.F.
At the time of his death Dr. MacKay was survived by his wife Edna Catherine Hana MacKay of 148 Old Forest Road, a son Ross, a daughter Ann, a brother Dr. Alex MacKay of Toronto (a dentist), and two sisters Carrie of McLeman, Alberta and Laura of Woodstock, Ontario.