Martha S. Thomsen


Martha Thomsen Photo

Washington, D.C.

P: +1.202.639.7863
F: +1.202.508.9329

Ms. Thomsen is an experienced environmental litigator and advisor. Her litigation practice includes trial as well as appellate work, with a focus on complex litigation arising under a variety of federal and state environmental statutes.

Ms. Thomsen has particular experience in highly technical suits involving waste and water issues, including various suits and a recent bench trial arising under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA). As part of her litigation and CERCLA work, Ms. Thomsen engages with experts and consultants on cost, allocation, and remediation issues.

Ms. Thomsen also regularly advises clients on compliance with state and federal environmental laws and represents clients before environmental agencies. She takes a holistic approach to regulatory compliance issues that accounts for short-term and long-term client planning, agency and other stakeholder positions, and technical compliance criteria and requirements. This work spans a variety of environmental statutes, including CERCLA as well as the Resource Conservation and Recovery Act (RCRA), Clean Water Act (CWA), wildlife, and state laws. Particular areas of experience include coal combustion residuals (CCR) liability and regulatory issues, as well as renewable and clean energy projects.

In 2021, Ms. Thomsen was recognized both by Chambers USA as an environmental “Associate to Watch” and by Bloomberg Law as a “Fresh Face to Know in Environmental Law.”

Prior to joining Baker Botts in 2012, Ms. Thomsen interned for the Department of Justice. She also worked as legal research assistant at the University of Michigan in the area of liability insurance.

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