Photograph of Mark Thomson


  • University of Wisconsin – Madison, B.A. (2008)
  • University of Minnesota Law School, J.D. (2012) magna cum laude, Order of the Coif


  • District of Columbia
  • Minnesota
Mark Thomson, Associate Washington, D.C.
Phone: +1 202.624.2706
1001 Pennsylvania Avenue NW
Washington, DC 20004-2595

Mark Thomson is an associate in the firm’s Environment & Natural Resources and Energy groups, where he handles litigation and appeals, regulatory counseling, and enforcement matters across a variety of industries. He has worked on matters involving the Clean Air Act, the Clean Water Act, the Endangered Species Act, the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA), the Surface Mining Control and Reclamation Act, and the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), among other statutes.

Mark earned his B.A., with comprehensive honors, from the University of Wisconsin-Madison. He earned his J.D., magna cum laude and Order of the Coif, from the University of Minnesota Law School, where he was a lead editor of the law review. After law school, he clerked for Judge Robert Jonker of the U.S. District Court for the Western District of Michigan, for Judge John Rogers of the U.S. Court of Appeals for the Sixth Circuit, and for Chief Judge Ed Carnes of the U.S. Court of Appeals for the Eleventh Circuit. Mark also spent a year in private practice with a large firm in his hometown of Minneapolis.


Admitted to practice: District of Columbia, Minnesota


  • "Open Minds and Harmless Errors: Judicial Review of Postpromulgation Notice and Comment," 101 Cornell L. Rev. 261 (2015). Co-Author: Mark Thomson.
  • "Method or Madness: The Leflar Approach to Choice of Law as Practiced in Five States," 66 Rutgers L. Rev. 81 (2013). Author: Mark Thomson.
  • "Who Are They to Judge?: The Constitutionality of Delegations by Courts to Probation Officers," 96 Minn. L. Rev. 306 (2012). Author: Mark Thomson.

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