Will McDowell's wide-ranging practice has included many landmark cases, most notably in the Supreme Court of Canada. He appears in commercial litigation, libel and public law cases. From 2005 to 2008, he was Canada’s Associate Deputy Minister of Justice, with responsibility for civil litigation, national security and issues involving central agencies. He acted for the Chief of Police of Toronto, the Chief Adjudicator of the Independent Assessment Process of the Truth and Reconciliation Commission and as amicus to the Superior Court in relation to Aboriginal land occupations in Brantford. In August 2017, he was named Chief Commission Counsel to the Gillese Inquiry. McDowell’s work in resolving the landmark Maher Arar v. Canada case was honoured by a Department of Justice National Award. McDowell is an elected Bencher of the Law Society of Upper Canada.