He served as a Member of the Senate from 6 November 1956 until 5 June 1963, and from 2 July 1963 until 3 June 1976. He was the Parliamentary leader of People's Party for Freedom and Democracy in the Senate from 24 March 1959 until 3 June 1976. A colourful politician, he was a mentor to former Party Leader of the People's Party for Freedom and Democracy Hans Wiegel during his leadership. Harm van Riel Hoofddorp 18 februari 1907 - 's-Gravenhage 13 december 1980, Stichting Digitale Bibliotheek voor de Nederlandse Letteren, 20 August 1983
