Washington, DC

John B. Gustafson

  • Associate
  • Direct Dial: +1 202.434.4204
  • Fax: +1 202.434.4646
  • Professional Assistants: Kristin Marcil and Caroline Mills , Ph: +1 202.434.4343

    Washington, DC

    1001 G Street NW
    Suite 500 West
    Washington, DC 20001

John Gustafson primarily practices environmental law. He counsels clients on regulatory compliance and enforcement and litigates related matters.

Specifically, Mr. Gustafson assists clients with issues arising under FIFRA, TSCA, the OSH Act, and California Proposition 65. He has litigated at trial and appellate levels, participated in EPA and CDPR enforcement negotiations, and appealed standards developed by private standards development organizations. He variously assists clients with B-to-B contracting conflicts, advertising disputes, and labor and employment issues.

Prior to joining Keller and Heckman, Mr. Gustafson clerked for The Honorable Judge Douglas R.M. Nazarian on the Maryland Court of Special Appeals.

In law school, Mr. Gustafson served as Co-President of the Maryland Environmental Law Society and as a Staff Editor of the Journal of Business and Technology Law. John was recognized as a Fedder Environmental Fellow and presented his research on dormant Commerce Clause challenges to renewable energy portfolio standards at the 2014 Annual Colloquium of the IUCN Academy of Environmental Law in Tarragona, Spain.


Practice Areas


  • Ohio State University
    • B.A., 2009, English
  • University of Maryland Francis King Carey School of Law
    • J.D. , 2016

Bar Admissions

  • District of Columbia
  • Maryland