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Washington, DC
Greg Clark
©2021 Keller and Heckman LLP

Greg Clark advises clients on regulatory and environmental issues, focusing on the Toxic Substances Control Act (TSCA), the Clean Air Act (CAA), state volatile organic compound (VOC) regulations, the Federal Insecticide, Fungicide and Rodenticide Act (FIFRA), and the Clean Water Act (CWA), and the Resource Conservation and Recovery Act (RCRA).

Greg assists clients needing approval of new chemical substances, genetically modified organisms, and pesticides under TSCA, FIFRA, and similar laws abroad. Clients seek his expert guidance through the Premanufacture Notification (PMN), Low Volume Exemption, Microbial Commercial Activity Notice (MCAN), and TSCA Environmental Release Application (TERA) review processes. He also assists clients by negotiating the terms and conditions of TSCA Section 5(e) consent orders and Significant New Use Rules (SNURs). Additionally, Greg advises companies seeking to market biotechnology-derived products and their production platforms (including bacteria, yeast, algae, and plants) navigate the complex regulatory requirements administered by the Environmental Protection Agency (EPA), the Food and Drug Administration (FDA), and the Animal and Plant Health Inspection Service (APHIS).  

Greg’s experience and expertise allows him to advise companies and trade associations on the prioritization, risk evaluation, and risk management of existing chemicals, including chemicals on the 2014 TSCA Work Plan, following the Lautenberg Act amendments to TSCA. Through this work, he develops detailed comments and regularly interacts with EPA staff. He assists companies on periodic reporting under the TSCA Chemical Data Reporting Rule and other agency reporting programs. He also designs, conducts, and coordinates comprehensive internal audits of TSCA compliance for existing operations under EPA’s “Audit Policy”, as well as under other penalty mitigation policies.

Greg has extensive experience representing clients in CAA rulemakings and enforcement matters before administrative agencies, including drafting highly technical comments, filing petitions for reconsideration and judicial review, and meeting with agency staff. 

Greg has a background in molecular biology and emergency preparedness, offering him a unique foundation from which to advise his clients and assist the firm.

Representative Matters

  • Organized and conducted a voluntary TSCA compliance audit of a specialty chemicals company covering hundreds of products and multiple sites, resulting in elimination of significant civil monetary penalties
  • Represented a trade association before the U.S. EPA and the U.S. Court of Appeals for the District of Columbia Circuit in a challenge to a Clean Air Act regulation
  • Represented a specialty chemicals company in obtaining chemical inventory corrections for a key product in the U.S., Canada, and Australia
  • Represented a commercial and consumer products company in $10 million enforcement proceedings initiated by a California air district concerning VOC regulations for consumer products


  • American Bar Association, Pesticide, Chemical Regulation, and Right-to-Know Committee


James Madison University
magna cum laude
University of Virginia