Daniel L. Leone

Partner Toronto, T: 416.869.8545 C: 416.727.8545 F: 416.862.8247

Katrina Sorochinsky, Paralegal Assistant 416.862.8280 x391 ksorochinsky@mathewsdinsdale.com


Bar admission

Law Society of Ontario


Brock University, B.A. (Hons.)
Queen’s University, LL.B.

Membership and affiliations

American Bar Association
Canadian Association of Counsel to Employers (CACE)
Canadian Bar Association
Ontario Bar Association


Dan is an experienced legal advisor, collective bargaining spokesperson and labour litigator who has been assisting employers in all areas of workplace law for over 20 years.  He is repeatedly recognized as one of the leading labour relations lawyers in Canada by Best Lawyers in Canada and the Canadian Legal Lexpert Directory.

Dan represents employers in both the public and private sectors including:  Education; Long-Term Care; Power Generation and Distribution; Waste Management; Construction; Manufacturing; Engineering; Food Production; Meat Processing; Transportation; Retail; Pharmaceutical; and Information Technology.

He is well known for providing both practical and strategic advice to his clients in a timely and comprehendible manner, resulting in creative and cost effective solutions that best suit his client’s sector, individual business and specific needs.

Dan is also very well known for being one of the most experienced labour litigators in Ontario having appeared as counsel in hundreds of hearings before Rights and Interest Arbitrators, the Ontario Labour Relations Board, the Canada Industrial Relations Board, and the Human Rights Tribunal of Ontario.

He assists and represents employers on a broad array of matters including: grievance arbitrations; human rights complaints; employment standards complaints; unfair labour practice complaints; union organizing; applications for certification; unlawful strikes; merger, acquisition, sale and restructuring of a business; and policy creation.

Dan is an active member of the Canadian Bar Association and the Labour and Employment Law and Alternative Dispute Resolution Sections of both the Ontario and American Bar Associations and is on the Executive (Public Affairs Liaison) for the Education Law Section of the Ontario Bar Association.  He is also the Co-Chair of Mathews Dinsdale’s Associates Committee and a regular Speaker in the Firm’s webinar series.

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