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Kirsten Nathanson

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When companies face environmental regulatory enforcement—whether from the U.S. EPA, the DOJ, other government agencies, citizen activist groups, or other private parties—they turn to Kirsten Nathanson as a strategic and pragmatic legal advisor to navigate the myriad risks and drive toward efficient and positive outcomes. In addition to handling litigation encompassing citizen suit defenses; National Environmental Policy Act challenges; CERCLA remediation cost recoveries and defenses; Federal Insecticide, Fungicide, and Rodenticide Act actions; and EPA enforcement, Kirsten’s practice includes a focus on consensus-based dispute resolution and multilateral negotiations and mediation.

Kirsten also serves as a strategic counselor in emerging risk areas, including PFAS and emerging contaminants, particularly when they intersect with all forms of regulatory enforcement and dispute resolution. She supports clients across a range of industries, including energy, agricultural technology, and transportation.

Kirsten is co-chair of the firm’s Environmental Group and has served on the firm’s Management Board and Executive Committee.

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On July 23, 2025, the White House released Winning the Race: America’s AI Action Plan (“the Plan”) the Trump Administration’s most significant policy statement on artificial intelligence to date.Continue Reading White House AI Action Plan Seeks to Establish “Dominance,” Boost Innovation, and Scrutinize Regulations

On April 19, 2024, EPA signed the highly anticipated final rule designating two types of PFAS as hazardous substances under section 102(a) of the Comprehensive Environmental Response, Compensation, and Liability Act (“CERCLA”).  At the same time, David M. Uhlmann, Assistant Administrator for Enforcement and Compliance Assurance of the EPA, released an enforcement policy memorandum that provides “direction to all EPA enforcement and compliance staff about how EPA will exercise its enforcement discretion under CERCLA in matters involving PFAS, just as EPA exercises enforcement discretion regarding other hazardous substances.”  This alert summarizes key points from the enforcement policy and flags various uncertainties that lie ahead. Continue Reading EPA’s Busy April for CERCLA and PFAS:New CERCLA Authority, an Enforcement Escape Hatch, and the Continued Search for Viable Cleanup Technologies