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Keller and Heckman LLPPartner
Gregory A. Clark
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Gregory A. Clark

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1001 G Street NW, Suite 500 West, Washington, DC 20001

Biotechnology, Chemical Control, Environmental and 10 more

About Gregory A. Clark

Greg Clark counsels clients on regulatory and environmental issues, focusing on the Toxic Substances Control Act (TSCA), the Clean Air Act (CAA), state volatile organic compound (VOC) and per- and polyfluoroalkyl (PFAS) regulations, the Federal Insecticide, Fungicide and Rodenticide Act (FIFRA), 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 (GMOs), and pesticides under TSCA, FIFRA, and similar laws abroad. Clients value his extensive experience guiding them 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) while navigating the complex regulatory requirements administered by the U.S. Environmental Protection Agency (EPA), the U.S. Food and Drug Administration (FDA), and the U.S. Department of Agriculture (USDA) Animal and Plant Health Inspection Service (APHIS).

Greg’s extensive background enables him to provide guidance to 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 with 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 in-depth knowledge 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.

Awards

•Best Lawyers: Ones to Watch in America: Environmental Law, 2024 - 2025

Insights & In the News

EPA Takes Steps to Limit the Use of Certain PFAS

01.11.2024
Publication

APHIS Extends Comment Period on Proposed Exemptions for Genetically Modified Plants

12.21.2023
Publication

APHIS Proposes Five New Exemptions for Genetically Modified Plants

12.11.2023
Publication

More Insights

Best Law Firms Features Keller and Heckman in 2026 Edition

Press Release
11.06.2025

 

Gregory A. Clark (Washington, District of Columbia) View website

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Services

Areas of Law

  • Technology and Science 1
    • Biotechnology
  • Other 12
    • Chemical Control
    • Environmental
    • Pesticides
    • TSCA
    • Chemicals and Plastics
    • Consumer Products and Retail
    • Digital Media, Technology, and Telecommunications
    • Energy, Infrastructure, and Transportation
    • Food & Life Sciences
    • Packaging
    • Tobacco and E-Vapor
    • Trade Associations

Practice Details

  • Firm Information
    Position
    Partner
    Firm Name
    Keller and Heckman LLP
  • Representative Cases & Transactions
    Cases
    Representative Matters: Litigated the first challenge to a TSCA section 4 test order
    Counseled multiple TSCA testing consortia on responding to
    complying with TSCA section 4 test orders
    Drafted
    filed comments on behalf of companies
    trade associations concerning TSCA section 6 prioritization, risk evaluation,
    risk management actions
    Organized
    conducted a voluntary TSCA compliance audit of a specialty chemicals company covering hundreds of products
    multiple sites, resulting in elimination of significant civil monetary penalties
    Represented a trade association before the U.S. EPA
    the U.S. Court of Appeals for the District of Columbia Circuit in a challenge to a CAA regulation
    Represented a specialty chemicals company in obtaining chemical inventory corrections for a key product in the U.S., Canada,
    Australia
    Represented a commercial
    consumer products company in $10 million enforcement proceedings initiated by a California air district concerning VOC regulations for consumer products
  • Additional Links
    https://www.khlaw.com/people/gregory-clark

Experience

  • Bar Admission & Memberships
    Admissions
    2010, Virginia
    District of Columbia
    Memberships

    Memberships

    •American Bar Association (ABA), Pesticide and Chemicals Committee, Vice Chair (2023 - 2024)

  • Education & Certifications
    Law School
    University of Virginia
    Class of 2010
    J.D.
    Other Education
    James Madison University
    Class of 2005
    B.S.
    magna cum laude

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Attorneys FAQs

  • What year was this attorney first admitted to the bar?
    Gregory A. Clark was admitted in 2010 to the State of Virginia.
  • Is this attorney admitted to the bar in more than one state?
    Yes, Gregory A. Clark is admitted to practice in District of Columbia and Virginia.
  • How many attorneys are in this law firm?
    Keller and Heckman LLP has 80 attorneys at this location.
  • What law school did this attorney attend?
    Gregory A. Clark attended University of Virginia.
  • What year was this attorney's law firm established?
    Keller and Heckman LLP was established in 1962.

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