Many former students have gained prominence for serving in government. Croatian Prime Minister, Tihomir Orešković was an alumnus of the university. Lincoln Alexander, the former Lieutenant Governor of Ontario, as well as the first visible-minority Lieutenant Governor in Canada was another alumnus of the university. Canadian premiers that have graduated from the university include the former premier of Ontario, Dalton McGuinty, and the former premier of Saskatchewan, Tommy Douglas. Many graduates have also served in the House of Commons of Canada, including, Tony Valeri, the Government House Leader; and Lawrence Pennell, the Solicitor General of Canada. Roy Kellock, a Justice of the Supreme Court of Canada was a graduate from the university. Charles Aubrey Eaton, a member of the United States House of Representatives, and signor of the United Nations Charter on behalf of the United States, was an alumnus of the university.