In the decade following its founding, the Ontario Green Party did not have a formal leadership structure, and was run in a very decentralized manner (nominal leaders were sometimes chosen for elections, but they had no personal authority over party decisions). Frank De Jong

Frank de Jong

Frank de Jong, is a Canadian politician, environmentalist and elementary school teacher at Fern Avenue Public School...

 and others opposed this approach, and successfully campaigned for a formal leadership contest in 1993.

Green Party of Ontario leadership election, 1993

Frank De Jong entered this contest, and defeated Jim Harris, who later became leader of the Green Party of Canada

Green Party of Canada

The Green Party of Canada is a Canadian federal political party founded in 1983 with 10,000–12,000 registered members as of October 2008. The Greens advance a broad multi-issue political platform that reflects its core values of ecological wisdom, social justice, grassroots democracy and...

.

Green Party of Ontario leadership election, 2001

De Jong was challenged for the leadership of the Ontario Green Party by Judy Greenwood-Speers in 2001 and was re-elected.

Green Party of Ontario leadership election, 2009

In 2009, de Jong announced that he will be stepping down as party leader. His successor will be chosen at the November 13–15, 2009 Ontario Green Party leadership election. Mike Schreiner

Mike Schreiner

Mike Schreiner is the leader of the Green Party of Ontario . Professionally, he is a small business advocate, entrepreneur and food policy expert. Schreiner was the party's candidate in the Haliburton—Kawartha Lakes—Brock by-election on March 5, 2009...

was the only candidate to enter the race and his election was affirmed on November 14, 2009.