Since his call to the bar, Leo has had an extensive trial practice in the Superior Court of Justice and the Ontario Court of Justice. He has represented individuals charged with drug and weapons offences, attempted murder, aggravated assault, dangerous driving, sexual offences, and fraud. Additionally, Leo has extensive experience as junior counsel on homicide and terrorism files.
Leo is a graduate of the University of Ottawa, and holds a Master’s degree in International Politics from Carleton University. He has been a guest lecturer at the law school on trial advocacy and sentencing. In 2011 and 2012, he coached the University of Ottawa Arnup Cup moot team.
As a result of his trial experience, Leo has developed an expertise in the exclusion of evidence and the law on arrest, search and seizure, and the right to counsel. Leo has been involved in several cases associated with the mistreatment of prisoners in the police station cell block. He has authored articles on the exclusion of firearms, as well as the power of citizen’s arrest, and has presented his papers at criminal law conferences. Presently, Leo is a member of the Criminal Lawyers' Association, the Canadian Civil Liberties Association, and the Defence Counsel Association of Ottawa, and regularly contributes to their newsletters.