As a former US Environmental Protection Agency (EPA) senior attorney, Greg uses his agency experience to resolve difficult environmental matters. He brings over 20 years of practice in environmental law and has particular knowledge of PFAS, CERCLA/Superfund, TSCA, FIFRA, and RCRA. According to Chambers USA, “Greg has an exceptional ability to make complex issues understandable” (2024).

Greg co-chairs the firm’s chemical regulatory and PFAS practices and advises clients across diverse industries—including chemical, pesticide, oil and gas, electric utility, food and beverage, electronics and semiconductors, financial services, private equity, retail, mining, rail, airline, and marine transport—in environmental regulatory, counseling, enforcement defense, litigation, and transactional matters. Greg was involved in shaping and framing some of the earliest site remediation enforcement actions involving PFAS and analyzing EPA’s statutory and regulatory authorities to address PFAS contamination under existing law. His experience in both private and public practice helps him navigate the regulatory process with an informed understanding of government decision-making and strategies for efficiently resolving complex legal and policy issues. Drawing on his EPA experience, he has negotiated settlements saving clients millions of dollars in penalties in EPA enforcement actions, particularly under TSCA and FIFRA. He also has significant experience related to the acquisition and sale of environmentally-impaired property, conducting voluntary cleanups, negotiating environmental liability transfers, and the re-development of brownfield sites, including for renewable energy projects. 

Greg practiced CERCLA at the highest levels in the federal government and relies on that experience in his defense of clients facing government enforcement or private party contribution actions. Greg previously served as the lead EPA Headquarters attorney on cleanup enforcement cases at Superfund sites with remedies exceeding $1 billion. He not only worked on national CERCLA matters, but also authored national guidance documents and drafted model settlement documents used by EPA nationwide. During his EPA tenure, Greg received numerous EPA and DOJ awards, including for his work on the Administrator’s Superfund Task Force and the development of EPA’s national enforcement response to the US Supreme Court’s landmark decision in Burlington Northern & Santa Fe Railway v. United States.

Greg is an adjunct professor at William & Mary Law School, teaching Environmental Law and the Regulation of Toxic Substances and Hazardous Waste.

Bar Admissions

Education
JD, Wake Forest University School of Law, 2004

BS, Tufts University, 1999

• Do You Import Products for Commercial Sale? Have You Heard About the ‘Forever Chemicals?’

  By Gregory Wall |August 2021

• Got COVID-19 "Claims": Recent US EPA Enforcement under FIFRA Emphasizes Compliance Demands on Pesticide Product Supply Chains, Especially for Products Claiming to be Effective Against Coronavirus

  By Gregory Wall |November 2020

• Developments in the States to Address Climate Change, Washington Climate Change Report
• US EPA Issues New Guidance on the Federal Audit Policy for Self-Disclosing Environmental Violations, LawDay
• Unraveling the Glorious Mess: An Analysis of EPA’s Authority to Regulate GHG Emissions under Today’s Clean Air Act, Washington Climate Change Report
• Congressional Climate Change Activity in Early 2008, Washington Climate Change Report
• Aftermath of Massachusetts v. EPA: What Happens Next at the EPA, Washington Climate Change Report
• US Regulatory Aspects of Standardization for Nanotechnologies, ASTM Standardization News
• EPA issues PFAS Strategic Roadmap swiftly followed by other key PFAS announcements, Westlaw Today
• EPA’s New Approach to Risk Management For Chemicals Under the Toxic Substances Control Act, PCI Magazine
• COVID-19 Pushes Demand for Surface Disinfectants to Fever Pitch, Raising Regulatory and Litigation Risk, Thomson Reuters Westlaw
• EPA Proposal Under TSCA Would Prohibit or Restrict Most Uses of Methylene Chloride, Coatings World
• EPA Issues Near Zero Drinking Water Health Advisories for Certain PFAS, The National Law Review
• Heading Down Different Paths: An Update on PFAS Regulatory Developments in Northeastern States and at the Federal Level, Environmental Law Institute
• Do the Products You Sell Contain PFAS? A Question Every Retailer Must Be Prepared to Answer, Retail Industry 2022 Year in Review
• What EPA Enviro Justice Guidance Means For Chemical Cos., Law360
• What could the US EPA’s proposed Superfund listing for PFOA and PFOS mean for industry?, Chemical Watch
• 2020 Retail Industry Year in Review
• PFAS: New Targets for Proposition 65 Litigation, The Recorder