He represented 5th Kings in the Legislative Assembly of Prince Edward Island from 1978 to 1986 as a Progressive Conservative.
[1] Johnston was born in 1926 in Murray Harbour North, Prince Edward Island.
[1] In 1965 he purchased a small country store, which he operated with his wife and children, and two years later he opened a tent and trailer park.
[1] Johnston first attempted to enter provincial politics in the 1974 election, but was defeated by Liberal candidate Waldron Lavers.
[2] Johnston ran again in the 1978 election, defeating Lavers by 49 votes to become councillor for the electoral district of 5th Kings.