Hon. Marjory LeBreton, P.C. Senator LeBreton who was summoned to the Senate in June, 1993 has held many positions in her decades long career in the Conservative Party, including Deputy Chief of Staff to The Prime Minister, Chief Senate Opposition Whip, Chair of the Ontario Conservative Senators Caucus, Cabinet Minister in the Stephen Harper government as Leader of the Government in the Senate (2006-2013) and Minister of State, Seniors (2007-2010). She retired in July, 2015.