Gregory D. Hersen*

Tel: 416 777 5400 Fax: 1 888 812 2560
*Legal services provided through Gregory D. Hersen Professional Corporation


Greg is a partner of the firm and the Chair of our Construction Law Group. He has been certified by The Law Society of Ontario as a Specialist in Construction Law since May, 2001. Greg practises exclusively in the area of construction law, on behalf of public and private owners, general contractors, sureties, subcontractors, suppliers, financial institutions and design professionals. Greg provides ongoing strategic advice to clients throughout the life cycle of a construction project. His practice includes advising clients in a wide range of construction issues, including claims relating to tender disputes, claims for lien, deficiencies, contract termination and abandonment, extras, delay, negligence, surety bonds and indemnity agreements, and breaches of trust.

In addition to advocating for his clients through the courts at trial and appellate levels, Greg regularly participates in alternative dispute resolution processes including negotiation, mediation and arbitration. His practice includes drafting tender documentation, construction contracts and professional service contracts related to construction. He also provides advice related to contract compliance, Ontario’s new Construction Act, proper holdback release and written notices of lien.

Greg was the first lawyer to be appointed as a member of the Canadian Construction Documents Committee (CCDC), where he participated in the revision and development of standard CCDC construction contracts, including the CCDC 2 - 2008 Stipulated Price Contracts and other documents, for over a decade.

Greg regularly presents seminars to clients, educational institutions and professional groups, including design professionals. He has also presented numerous Continuing Legal Education Programs for the Ontario Bar Association, The Law Society of Ontario and the Canadian Bar Association.

Awards & Recognition

  • The Best Lawyers in Canada© - Construction Law (2017 - present)
  • The Canadian Legal Lexpert Directory - Repeatedly Recommended, Construction Law
  • Charter Fellow of the Construction Lawyers Society of America (CLSA) - Top Construction Lawyers 
  • Martindale-Hubbell - Distinguished Peer Review Rating 


  • The Advocates’ Society
  • Canadian Bar Association - National Construction Law Section Executive, Member-at-Large, 2007-present
  • Trial Law Institute
  • Diversity Law Institute
  • Grand Valley Construction Association
  • Metropolitan Toronto Lawyers Association
  • Ontario Bar Association - Construction Law Section, Past Chair, 2006-2007
  • Ontario Bar Association - Construction Law Section Executive, Member-at-Large, 1996 - 2006
  • Canadian Construction Documents Committee (CCDC), Past Ex-Officio Member – 1999-2007

Community Involvement

  • 2nd Degree Black Belt in Shotokan Karate


  • LL.B., University of Windsor, 1989
  • B.A., University of Western Ontario, 1986


  • Certified by the Law Society of Ontario as a Specialist in Construction Law, 2001 — present
  • Called to the Ontario Bar, 1991