Born in Orangeville, Ontario, Maharg moved west and settled near Moose Jaw in 1890 where he became a grain farmer and cattle breeder.

[1] Maharg entered politics and was elected as the Member of Parliament representing Maple Creek in the House of Commons of Canada as a Unionist.

In 1919 he crossed the floor to join Thomas Crerar and other MPs to form the populist Progressive Party of Canada.

[1][2] In 1921, Meharg was recruited by Premier William Melville Martin to join the Liberal government of Saskatchewan as Minister of Agriculture.

[1] Following his political career Maharg returned to farming and also served as the Co-operative Elevator Company's representative on the provisional board of the newly formed Saskatchewan Wheat Pool.