He represented the electoral district of Trinity North in the Newfoundland and Labrador House of Assembly from 1972 to 1989. The son of William Robert Brett and Phoebe Elizabeth Keats, he was born in Barr"d Island, Newfoundland and was educated there and at Memorial University. Brett was a business administrator.
Brett was elected to the Newfoundland assembly in 1972.
He served in the provincial cabinet as Minister of Social Services, as Minister of Consumer Affairs and Environment and as Minister of Transport and Communications. He resigned his seat soon after being reelected in 1989.