The son of William Cahill, he was educated in Campbell's Bay, Quebec.

Cahill worked as a postal clerk in Sault Ste.

Marie, Michigan for several years, then moved to Saskatchewan, working as a real estate broker in Saskatoon.

[1] He was elected to the House of Commons of Canada as a Member of the Liberal Party (Laurier Liberal) caucus in the 1917 election to represent the riding of Pontiac.

This article about a Quebec Member of Parliament from the Liberal Party of Canada is a stub.