John J. Longo

Partner* Admitted to the Ontario Bar: 1989

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*Practising as a professional corporation
  • Bio
  • Awards & Recognition
  • Professional Involvement
  • Selected Publications
  • Education

Over a long career in litigation, John has developed an outstanding reputation based on his honest and straight forward approach. Drawing on a strong business background, John provides his clients with practical solutions from a commercial perspective. No matter the size of client, John delivers exceptional service and understands the importance of each case.

John is a member of the Litigation & Dispute Resolution Group and the Intellectual Property Group as well as Chair of the firm's Conflicts Committee. He practises in the area of civil litigation, with an emphasis on corporate and commercial matters, including a wide variety of disputes involving all forms of commercial contracts, shareholder and partnership dispute litigation, securities litigation, insurance litigation, patent litigation and class actions.

John also regularly advises on pension and benefits issues in the context of corporate transactions, financings and insolvencies. His practice emphasizes all aspects of pension and benefits matters, including plan administration and governance, wind-ups and surplus utilization and withdrawal issues.

John has appeared before all levels of court, including the Supreme Court of Canada.

John summered and articled at the firm and has been with Aird & Berlis for over 25 years in total. 

Awards & Recognition

  • Recognized in The Best Lawyers in Canada in Corporate and Commercial Litigation

Professional Involvement


  • Canadian Pension and Benefits Institute
  • Toronto Lawyers Association

Selected Publications

"Aquatic Facility Liability," Pool & Spa Marketing, August 2008.

"Beware – Exchange of E-Mails May Constitute a Binding Contract," Aird & Berlis LLP Commercial Litigation Bulletin, March 2008.

"The Oppression Remedy: A Useful Tool When Mixing Business and Family," Aird & Berlis LLP Commercial Litigation Bulletin, October 2007.

"What to do When a Competitor Unlawfully Steals Your Customers," Aird & Berlis LLP Commercial Litigation Bulletin, August 2007.

"Bad Faith Conduct Doesn't Mean a Fundamental Breach of Contract," Aird & Berlis LLP Commercial Litigation Bulletin, June 2007 and Canadian Lawyer, June 2007.

"Ten Things Everyone Should Know about Liability for Secondary Market Disclosure in Ontario," Aird & Berlis LLP Capital Markets Bulletin, January 2006.

Co-Author with Fred Cass and Peter Atkinson; Discovery: Law, Practice and Procedure in Ontario, published by Carswell in 1993.


  • LLB, University of Ottawa, 1987
  • B.Com., University of Toronto, 1983