From 1950 to 1965, the Indian Affairs portfolio was carried by the Minister of Citizenship and Immigration.
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He was the province's Minister of Citizenship and Immigration and Minister Responsible for the 2015 Pan and Para Pan American Games in the Cabinet of Premier Dalton McGuinty until November 9, 2012 when he resigned in order to enter the Liberal Party's leadership election.
In 2007, Gilleshammer was appointed as a Citizenship Judge by the Canadian Minister of Citizenship and Immigration Diane Finley.