He represented Medicine Hat in the Legislative Assembly of the Northwest Territories from 1888 to 1894 as a Conservative.

He was born in Kingston, Canada West, the son of Thomas Tweed and Jane Hiditch, and was educated there.

Tweed was employed in cotton mills in Montreal and Cornwall, Ontario, reaching the position of manager.

He went west to Medicine Hat in 1883, where he established a general store in partnership with James Alexander Lougheed.

Tweed died in Montreal of heart failure at the age of 5 in 1906.