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Patrick G. Welsh

Patrick G. Welsh

Associate, Regulatory, Environmental, Aboriginal and Land

Contact Information

tel: 416.862.5951



Bar Admission

Ontario, 2011

  • Queen’s University, J.D.
  • Queen’s University, M.A.
  • Queen’s University, B.A. (Hons.) (Biology and History)

Patrick is a member of Osler’s Regulatory, Environmental and Aboriginal Law group, and is a member of Osler’s Litigation Department. 

Patrick provides transactional support on environmental issues arising during mergers and acquisitions, debt and equity offerings, and other corporate transactions.  Patrick has experience advising on issues relating to waste diversion, transportation of dangerous goods and hazardous wastes, emissions and discharges, contaminated lands, records of site conditions, maritime pollution and spills, regulatory orders, waste and soil, asbestos and other designated substances, and general environmental regulatory compliance. He regularly works with environmental consultants to address clients’ business needs. Patrick also has experience in regulatory proceedings before the Ontario Energy Board. 

Patrick is also cross-appointed to the International Trade group, and has experience in procurement challenges before the Canadian International Trade Tribunal and the Federal Court, and has been involved in multiple internal investigations pursuant to Canada’s anti-corruption and anti-bribery laws.

He has appeared before the Ontario Environmental Review Tribunal, the Ontario Superior Court (Commercial List), the Ontario Court of Appeal, and the Federal Court of Canada.

Patrick joined the firm as a summer student in 2009 and articled with the firm in 2010-2011, during which time he was seconded to the legal department of the Royal Bank of Canada.

  • Agnes Benidickson Tricolour Award (2010)
  • Gavel Award (2010)
  • John D.B. Walton Scholarship in Administrative Law (2010)
  • Davies Ward Phillip Vineberg LLP Prize in Corporations and Taxation (2010)
  • R.W. Leonard Prize in Alternative Dispute Resolution (2009)
  • David Sabbath Prize in Contract Law (2008)
  • Aird & Berlis LLP Award for Academic Achievement (2008)
  • Dean’s Silver Scholar Award (2008)

  • Law Help Ontario, Duty Counsel Volunteer

  • The Advocates’ Society
  • Canadian Bar Association
  • Ontario Bar Association
  • The Osgoode Society for Legal History