Ontario Superior Court adds judges Christine Mainville, Edward Iacobucci, Carolyn Leach, three others

Judicial appointments also include Sharon Tysick, Rosemarie Juginovic, J. Scott Cowan

Ontario Superior Court adds judges Christine Mainville, Edward Iacobucci, Carolyn Leach, three others
Christine Mainville, Edward Iacobucci

The Ontario Superior Court of Justice has welcomed six new judges: Christine Mainville (Toronto), Carolyn R. Leach (Toronto), Sharon A. Tysick (North Bay), Rosemarie A. Juginovic (Brampton), J. Scott Cowan (Owen Sound), and Edward M. Iacobucci (Toronto). 

Sean Fraser – Canada’s justice minister, attorney general, and minister responsible for the Atlantic Canada Opportunities Agency – announced these judicial appointments in a news release. 

“I wish Justices Mainville, Leach, Tysick, Juginovic, Cowan, and Iacobucci every success as they take on their new roles,” Fraser said. “I am confident they will serve Ontarians well as members of the Superior Court of Justice of Ontario.” 

The federal justice department’s news release provided more information regarding the recent appointees. 

Christine Mainville

Justice Mainville replaced Justice K.G. Hood in Toronto, who elected to be a supernumerary judge effective Apr. 30. 

Mainville worked on criminal law matters in Montreal before moving to Toronto. At Henein Hutchison Robitaille LLP, she practised criminal, penal, and disciplinary law for 13 years and became a partner. She started serving as a judge of the Ontario Court of Justice in Toronto in 2023. 

She earned a law degree from McGill University and a master’s degree in comparative criminal law from the Université Paris 1 Panthéon-Sorbonne. She clerked for Ian Binnie at the Supreme Court of Canada. She joined the Quebec bar in 2007 and the Ontario bar in 2011. 

Edward Iacobucci

Justice Iacobucci took the place of Justice K.B. Corrick in Toronto, who elected to be a supernumerary judge effective last Aug. 6. 

As a professor at the University of Toronto’s Henry N.R. Jackman Faculty of Law for more than 25 years, Iacobucci taught and wrote on various business, regulatory, and commercial law subjects. For six years beginning in 2015, he acted as the law school’s dean. 

He received an LLB from the University of Toronto as a gold medalist, clerked for John Sopinka at the Supreme Court of Canada, and joined the Ontario bar in 2003. 

Carolyn Leach

Justice Leach took the place of Justice F. Kristjanson in Toronto, who resigned as of last June 20. 

Leach worked for two decades at the Ministry of the Attorney General’s Office of the Children’s Lawyer. She then accepted a secondment to the Ministry of Children, Community, and Social Services in 2018. 

After transferring to the Ministry of the Attorney-General’s Indigenous Justice Division in 2022, she served as coroner’s counsel in inquests into the deaths of Indigenous individuals. 

Upon returning to the Office of the Children’s Lawyer in Toronto as deputy legal director for property rights last January, Leach oversaw the delivery of legal services to minors in trusts, estates, personal injury, and other civil matters. 

From Osgoode Hall Law School, she obtained an LLM (civil litigation and dispute resolution) in 2015 and an LLB in 1995. She joined the Ontario bar in 1997. 

Sharon Tysick

Justice Tysick replaced Justice G. Ellies in North Bay, who elected to be a supernumerary judge as of last Sept. 30. 

Upon becoming part of Kemp, Maille, Regimbal, Hamel & Tysick, she maintained a general practice and conducted prosecutions on behalf of the Public Prosecution Service of Canada. 

At the Ministry of the Attorney General’s Criminal Law Division, Tysick became an assistant Crown attorney in 2003, an acting Crown attorney for the Temiskaming District in 2013, and a Crown attorney for the Nipissing District in 2021. 

She received her LLB from Queen’s University in 1996. She served as a law clerk to Beverley McLachlin at the Supreme Court of Canada in 1997. She joined the Ontario bar in 1998. 

Rosemarie Juginovic

In Brampton, Justice Juginovic took the place of Justice M. Rahman, elevated to the Ontario Court of Appeal on Mar. 7. 

At the Scarborough Crown Attorney’s Office, Juginovic prosecuted criminal cases at the Ontario Court of Justice and Superior Court for almost two decades and served as deputy Crown attorney from 2017–21. 

She then joined the Office of the Chief Justice of the Superior Court in Toronto. She worked as senior criminal counsel from 2021–23 and became executive legal officer in May 2023. 

Juginovic earned her law degree from Dalhousie University law school in 2000 and joined the Ontario bar in 2002. 

J. Scott Cowan

Justice Cowan replaced Justice M.G. Emery in Brampton, who elected to be a supernumerary judge as of last Sept. 16. 

At Greenspan, Henein, and White, Cowan articled and worked as an associate lawyer. He then became principal of Cowan Law Chambers in Thornbury. 

Through his solo practice, he conducted criminal trials and appeals throughout Ontario. He then commenced practising in the country’s north in 2009. He handled various matters across 25 Inuit and First Nations communities in Nunavut and the Northwest Territories. 

Cowan obtained his LLB from the University of Saskatchewan in 2000 and his LLM from Osgoode Hall Law School in 2012. He joined the Ontario bar in 2002.