 He was also among the co-founders of the local savings bank, Frogn sparebank, in 1884 and was chairman of the board.Brandt was a member of Frogn municipal council from 1884 to 1912, serving as mayor from 1884 to 1895.He was elected to the Parliament of Norway in 1900 and 1903, representing the constituency of Akershus Amt.