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Environment • Aboriginal • Energy

Gatlin Smeijers


T: 416-642-4871  E:


Gatlin Smeijers advises and represents a wide range of clients in the areas of environmental law, chemicals regulation, and regulated products.  As an advocate, Gatlin represents clients in civil proceedings, administrative appeals, regulatory prosecutions, and government relations matters.

Environmental Law

Gatlin advises clients on complex environmental law issues including:

  • approvals for and the regulation of industrial discharges to air, land, and water
  • carbon emissions and pricing regulation
  • regulatory instruments and abatement involving contaminants in the natural environment
  • the movement, handling, and storage of potential contaminants and fuels, and
  • corporate officer and director environmental liability.

Gatlin also advocates for clients in regulatory prosecutions, administrative appeals, judicial reviews, and environmental civil litigation.  Gatlin has appeared before various boards and tribunals and at all levels of court in Ontario, including the Court of Appeal.

Chemicals, Dangerous Goods, and Regulated Products

Gatlin has considerable expertise in the areas of chemical substances, workplace products, and consumer products including:

  • providing comprehensive, practical, and business-oriented compliance advice
  • assisting with cross-border movements of chemicals, dangerous goods, and hazardous materials
  • advising on consumer and workplace product packaging and labelling compliance
  • assisting in navigating product stewardship and extended producer responsibility programs
  • assisting with regulatory reporting and product recalls, and
  • developing regulatory compliance policies and procedures.

Environmental Regulatory Compliance Audits and Investigations

Gatlin has extensive experience in coordinating and completing environmental regulatory compliance audits for a broad range of industrial and commercial clients.  In cases of a potentially serious non-compliance, Gatlin has worked with clients’ management and staff to complete thorough internal investigations.

Prior Environmental Experience

Prior to becoming an environmental lawyer, Gatlin worked in the field of environmental engineering on a variety of projects for the diversified manufacturing, pharmaceutical, aerospace and defence industries.  His engineering experience includes the design and installation of remediation systems for the in-situ treatment of recalcitrant compounds, vapour intrusion assessment and mitigation, and contaminant transport modelling.  While working in Canada and the United States, Gatlin helped implement assessment and remediation programs for industrial properties contaminated with PCBs, chlorinated solvents, and energetic compounds.


  • Chemical Manufacturers and Distributors
  • Diversified Manufacturers
  • Online Retailers
  • Energy Generators
  • Municipalities
  • Real Estate Developers
  • Insurers and Financial Institutions
  • Construction and Engineering Firms
  • Non-Governmental Organizations

Representative Work

Environmental Law

Private Arbitration—Successfully represented a high-rise condominium developer in a private arbitration concerning reimbursement of costs and expenses for the installation of protective measures to prevent migration of contamination from an offsite source.

High Level Negotiations with the Federal and Provincial Government—Assisted an NGO in assuming the management and operation of a former federally run environmental research program.  Assisted in drafting transfer and funding agreements, the development of federal and provincial regulations, and structuring of novel insurance instruments.

Carbon Pricing and Greenhouse Gas Emissions Advice—Advised a multi-national mining company about federal and provincial regulatory obligations concerning greenhouse gas emissions, quantification, reporting, and carbon pricing.

Chemicals and Regulated Materials

Regulatory Exposure Assessment—Advised a multi-national chemical manufacturer about federal and provincial regulatory liability risks associated with the introduction of new hydraulic fracturing fluids to the Canadian market.

Advice on Extended Producer Responsibility—Advised a multi-national chemical manufacturer about Canada-wide stewardship and waste diversion obligations for a portfolio of commercial and consumer chemical products.

New Substance Notification Compliance—Advised a multi-national chemical manufacturer about federal regulatory requirements for novel polymers and Unknown or Variable Composition, Complex Reaction Products and Biological Materials (UVCBs).




  • American Chemical Society—member
  • Canadian Bar Association—member
  • Law Society of Ontario—member
  • Ontario Bar Association—member


  • Called to the bar of Ontario (2012)
  • J.D., Queen's University (2011)
  • BASc., of Applied Science in Geological Engineering, University of Waterloo (2008)



"Willms & Shier is a bluechip environmental law firm."

Judge of the Ontario Superior Court of Justice