He represented 5th Queens in the Legislative Assembly of Prince Edward Island from 1912 to 1914 as a Conservative.
He was born in Marshfield, Prince Edward Island, the son of Alexander Stewart, and was educated at Prince of Wales College, Dalhousie University and McGill University.
He studied law with Frederick Peters, was called to the bar in 1883 and set up practice in Summerside.
Stewart served in the province's Executive Council as a minister without portfolio from 1912 to 1914.
He resigned his seat in that year after he was named a judge for Queens County.