Mark Warner was featured on CTV Your Morning about Canadian federal and provincial initiatives to remove interprovincial barriers to trade in response to the tariff threats from U.S. President Trump. (May 9, 2025) Mr. Warner is a Canadian and U.S. lawyer who has practiced in Toronto, Washington, D.C., New York and Brussels. Mark also previously worked on trade and competition issues as counsel in the OECD Trade Directorate where he participated in the negotiations of the Multilateral Agreement on Investment and represented the OECD at meetings of the WTO Working Group on Trade and Competition Policy and the Working Group on Trade and Investment.

As Legal Director of the Ontario Ministry of Economic Development & Trade, Mark was involved with various disputes under the Agreement on Internal Trade (AIT) and negotiations that lead to the Canadian Free Trade Agreement (CFTA). In addition, Mark led Ontario’s legal team for the negotiation of the the Canada-U.S. Agreement on Government Procurement and the Canada-EU Trade Agreement, including on matters including: Cross Border Trade in Services; Temporary Entry and Stay of Natural Persons for Business Purposes; Mutual Recognition of Professional Qualifications; and Regulatory Cooperation. and Mark also advised on trade disputes including the Green Energy Act and softwood lumber and various NAFTA Chapter 11 investor-state arbitration matters.

Mark is a past Chair of the International and Economics Committees of the American Bar Association Section of Antitrust Law as well as a member of the Section’s Task Forces on Competition Policy and NAFTA and Antitrust in the Global Economy. In addition to being a lawyer, Mr. Warner has a Masters Degree in Economics from the University of Toronto.