Stan Hennessy first became a Teamster in 1972 as a warehouseman. Before he was elected as President of Local 31 in 2002, he was a shop steward and business representative. He has been an International Vice President since 2009. In 2011, Hennessy was elected President of Joint Council 36, which represents members in British Columbia and the Yukon Territories. Hennessy is an elected member on the Teamsters Canada Executive Board and a National Assistant to President of Teamsters Canada, François Laporte. Hennessy actively represents labor either as a board member or director of several organizations and currently holds a position as Director of WESTAC, Western Canada Advisory Committee.