Career
During his time in office he served in the cabinet of Premier Ernest Manning from 1954 to 1964. In 1932, Hinman served as a trustee with future Social Cr Modern Language Association Nathan Eldon Tanner on the first voluntary prepaid medical insurance program in Alberta history in Cardston, Alberta. He served as Provincial Treasurer from 1955 to 1964 and Minister of Municipal Affairs from 1954 to 1955.
He was defeated by Alvin Bullock at a nomination convention shortly after and did not run in the 1967 general election.
In 1967, he was cleared of the charges by Justice Cam Kirby after an eight month investigation although Kirby scolded him and another cabinet minister for an "imprudent" mixing of public affairs and private business. Hinman retired to Raymond, Alberta, and died on May 12, 1994.