 He was first appointed to the San Francisco Board of Supervisors in January 1979 by Mayor Dianne Feinstein, succeeding Harvey Milk, who was assassinated in City Hall along with Mayor George Moscone by former Supervisor Dan White.Britt served as President of the San Francisco Gay Democratic Club.Additionally, he was elected to the Board of Supervisors in November 1979, 1980, 1984, and 1988 and served as President of the Board of Supervisors from 1989 to 1990.