Anthony's practice focuses primarily on patent litigation and trade-mark litigation. He has represented clients at all levels of courts up to the Ontario Court of Appeal and the Federal Court of Appeal, and before various administrative tribunals.

Anthony is recognized in Chambers Global: The World's Leading Lawyers for Business in the intellectual property litigation category. In The Best Lawyers in Canada 2009, he was voted by peers as one of the leading intellectual property lawyers in Canada. He has also been chosen one of the "World's Leading Patent Law Practitioners" by Managing Intellectual Property. He has also been recognized as an "IP Luminary" in a survey of the IP community published by Informa Law.

Anthony is the editor of Intellectual Property World Desk Reference: A Guide to Practice by Country, State, and Province, a two-volume summary of intellectual property laws and procedures in nearly 150 jurisdictions around the world, published by Kluwer. He is a member of the advisory board for IP Litigator magazine and is also a member of the editorial board for The Trademark Reporter.

Anthony is a member of the Litigation Committee of the Intellectual Property Owners Association (IPO). He has previously served on the International Trademark Association's Alternative Dispute Resolution Committee, and the Intellectual Property Institute of Canada's Litigation Committee and Intellectual Property Trade Policy Committee.