Marjory LeBreton (born July 4, 1940) is a Canadian former leader of the Government in the Senate of Canada, a cabinet-rank position; and past national chair of Mothers Against Drunk Driving in Canada. She worked with four leaders of the Progressive Conservative Party of Canada - John Diefenbaker, Robert Stanfield, Joe Clark and Brian Mulroney - from 1962 to 1993 before being appointed to the Senate on the advice of Mulroney. She sat as a Progressive Conservative Senator from her appointment until moving with most of her caucus colleagues to the new Conservative Party of Canada in 2004, of which she was soon elected to Chief Whip. She served as an advisor to then opposition leader Stephen Harper during the 2006 election, which the Conservative Party won. After the election, she was named to the cabinet position Leader of the Government in the Senate. On July 4, 2013, LeBreton announced she would not continue in the position as of the next cabinet shuffle, which occurred later that summer. She retired from the Senate upon reaching her 75th birthday on July 4, 2015. Early and personal life Marjory LeBreton was born in and completed her elementary and secondary school education in the neighbourhood of City View, in the city of Nepean, Ontario which is today part of Ottawa. She is married to Douglas LeBreton, with whom she had two children: Linda and Michael. Linda was killed in an accident involving a drunk driver which led to LeBreton's active involvement in the Mothers Against Drunk Driving organization. Progressive Conservative staffer LeBreton began working at Progressive Conservative party headquarters in 1962, moving from there to the office of leader John Diefenbaker when he became opposition leader following the 1963 election. During her time in the leader's office, she accompanied him on a national whistlestop tour during the 1965 election. Following Diefenbaker's resignation as leader, she continued in the leader's office under Robert Stanfield through his three election campaigns - 1968, 1972 and 1974. When Stanfield announced his resignation in 1975, she went to work in the PC Party office helping to coordinate the 1976 Progressive Conservative leadership convention. Joe Clark won the 1976 convention and hired LeBreton as his office's tour coordinator, a position she held until Clark won the 1979 federal election. LeBreton later worked in the office of Brian Mulroney while he was prime minister, rising to position of Deputy Chief