Jonathan "Jack" Koenig litigates complex matters arising under consumer protection and environmental laws. Mr. Koenig also advises clients on regulatory compliance issues, including with respect to consumer product labeling regulations, California's recycling regimes, California's unique toxics and labeling law (Proposition 65), environmental contamination cleanup programs, OSHA standards, and other consumer protection and environmental laws and regulations.

Mr. Koenig previously served as a prosecutor for the Navajo Nation Office of the Prosecutor, where he regularly tried cases.

Mr. Koenig graduated from Harvard Law School, with honors, in 2011, where he served as an Editor of the Harvard Civil Rights—Civil Liberties Law Review. While a law student, he also worked as an intern for the Honorable Joseph F. Battalion of the United States District Court for the District of Nebraska. Prior to law school, Mr. Koenig served in the United States Army.


  • Global energy corporation in litigation with the California Attorney General alleging violations of California's hazardous waste and underground storage tank laws and regulations.
  • Businesses in transactions involving contaminated properties, including coordination of due diligence efforts and allocation of environmental liabilities.
  • Developer in recovery of cleanup costs associated with contaminated property.
  • Clients in the cleanup of contaminated properties.
  • Various manufacturers with respect to recycling requirements under California recycling regimes.
  • Companies on compliance with OSHA standards.


EPA Issues Guidance Authorizing Use of CERCLA Special Account Funds by Qualified Redevelopers
The Chemical Compound—April 2018
Legal Updates on High Priority Chemicals and Important Chemical-Regulatory Developments
California's Safer Consumer Products Program: Update and Refresher
Arnold & Porter Webinar
The Chemical Compound—January 2018
Legal Updates on High Priority Chemicals and Important Chemical-Regulatory Developments
The Chemical Compound—October 2017
Legal and Regulatory Updates on High Priority Chemicals


  • JD, Harvard Law School, 2011, with honors
  • BS, University of Nebraska, 2006, with honors
  • California
  • Colorado
  • US District Court, Central District of California
  • US District Court, Northern District of California
  • US District Court, Southern District of California
  • US Court of Appeals for the Ninth Circuit
Government and Military Service
  • Medic, US Army

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