Justice Mary Meta Elizabeth Warren was called to the Ontario bar in 2014. She spent many years at Carroll & Wallace Barristers, including as an articling student and as a lawyer, appearing before the Court of Appeal for Ontario, the Superior Court of Justice and the Ontario Court of Justice. Since 2018, she has practised as a partner with the now former Stein & Warren Barristers, in association with Carroll & Wallace. Justice Warren has acted as counsel in a variety of criminal matters and worked in conjunction with family counsel when clients had related family law matters. She represented police officers across Ontario in Special Investigations Unit investigations and police discipline matters, represented complainants in sexual assault cases, worked on numerous public inquiries and acted as counsel at coroner’s inquests. Justice Warren has been per diem counsel for the Legal Services Board of Nunavut, also known as Nunavut Legal Aid, since 2019, often travelling to remote communities in the Arctic.
Justice Warren holds the roles of adjunct professor, clinic director and volunteer supervising lawyer with the Ticket Defence Program, a charitable organization that works with the University of Ottawa Faculty of Law to represent unhoused and low-income individuals with provincial fines and tickets. She has also acted as a volunteer lawyer with the Ontario Justice Education Network, providing public legal education to youth in conjunction with prosecutors and police officers.
Congratulations to Justice Warren on this appointment!
See the January 20, 2026, news release from the Attorney General of Ontario for more information.