John Keiller MacKay was born in 1888 in the village of Plainfield in Pictou County, Nova Scotia, and was educated at the Royal Military College (1909), Saint Francis Xavier University (BA 1912) and Dalhousie University (LL.B.1922).
John Keiller MacKay was born in 1888 in the village of Plainfield, Nova Scotia in Pictou County, Nova Scotia, the son of John Duncan and Bessie (Murray) MacKay. He was educated at the Pictou Academy, the Royal Military College (1909), Saint Francis Xavier University (BA 1912) and Dalhousie University (LL.B.1922).