Ontario Premier Dalton McGuinty announced Monday that he will resign as Liberal leader after his replacement has been chosen at a party leadership convention.

He said his daughter’s wedding and the party’s recent annual general meeting influenced his decision to resign but it also comes on the heels of several scandals at Queen’s Park, including the handling of the Ornge air ambulance service and the cancellation of two GTA power plants.

Below are some key political dates for McGuinty who has been the Ontario Liberal leader for 16 years.

1990: First elected as MPP to the Ontario legislature for Ottawa South, his father’s former riding.

1996: Elected leader of Ontario Liberal party, defeating frontrunner Gerard Kennedy.

Sept. 2, 2003: Takes Liberals to a majority government at Queen’s Park.

Sept. 10, 2007:
Wins second majority winning 71 of 107 seats in legislature.

Oct. 6, 2011: Elected to third term but loses majority status, winning only 53 or 107 seats.

Oct. 12, 2012: McGuinty announces plans to resign after the Liberal party convenes a leadership convention and elects a new leader.