He was named registrar in the Surrogate Court of the Midland District in 1814. Hagerman was one of the members of the establishment who argued with Robert Gourlay when Gourlay held meetings in Kingston. In 1820, he was elected to represent Lennox & Addington in the Legislative Assembly of Upper Canada.
He was appointed registrar in the Surrogate Court of the Midland District in 1814. Hagerman was one of the members of the establishment who debated with Robert Gourlay when Gourlay held meetings in Kingston. In 1820, he was chosen to represent Lennox & Addington in the Legislative Assembly of Upper Canada.