Jaimy Hamburg is a litigator and environmental lawyer who represents clients in complex environmental litigation, including toxic tort suits, class actions, citizen suits and government enforcement actions. In addition, Jaimy advises clients on environmental issues in the context of business transactions, such as asset and stock transactions, real estate transactions and financings. She also advises on the investigation and cleanup of contaminated sites.

Jaimy joined Mayer Brown in 1998, after three years of practicing environmental law with a large law firm in Washington, DC.

Spoken Languages

  • English


  • Toxic tort, product liability, and class actions — Represents clients against individual toxic tort claims, mass claims and class actions in federal and state courts alleging personal injuries and property damages. Cases have included claims involving chlorinated solvents, dioxins, PAHs, and heavy metals in connection with manufacturing facilities, manufactured gas plants, wood treatment facilities, petroleum refineries, and metals mining sites. Has also represented clients in product liability cases involving food flavorings and hydrochloric acid.
  • Cost recovery claims — Represents clients pursuing and defending private cost recovery as well as in suits brought by the federal government seeking cost recovery. Represented clients seeking cost recovery under CERCLA and state law from a former property owner, resulting in favorable summary judgment in the case of Spectrum International Holdings, Inc. v. Universal Cooperatives, Inc. (D. Minn. 2006). Represented a primary PRP at a historic metals mining site, including defense of CERCLA cost recovery action by the federal government, assertion of claim for cost reimbursement from the Superfund, and assertion of contractual claim for indemnity from another PRP.
  • Government enforcement actions — Represents clients against government actions arising out of alleged violations of environmental laws and permits. Defended a petroleum refinery in federal and state multi-media enforcement actions alleging violations of the Clean Air Act, the Clean Water Act, RCRA and state statutes. Defended a client in an enforcement action brought by the Illinois Attorney General regarding an alleged waste disposal site related to the federal government’s Operation Silver Shovel corruption probe.
  • Citizen suits — Represents clients in suits brought by citizens’ groups seeking injunctive relief and damages for alleged violations of environmental laws.
  • NEPA — Has represented clients in NEPA action against federal agency in connection with large international transportation infrastructure project in Detroit area.
  • Environmental issues in transactions — Has a varied practice that includes the evaluation of environmental risks and negotiation of related terms and agreements for clients involved in the purchase and sale of business assets and equity. Has conducted environmental due diligence and advised on risk management on behalf of lenders for loan portfolios secured by real property. Has represented a REIT in buying and selling real property, including the creation of escrows, environmental insurance and other mechanisms for post-closing environmental due diligence, cost sharing and risk management. Has conducted environmental due diligence on behalf of an investment bank for employee buy-out of a number of paper and paperboard manufacturing facilities.
  • Environmental investigations and cleanups — Advises clients on conducting environmental investigations and cleanups pursuant to federal and state law, including voluntary cleanup programs in Illinois and Minnesota.


University of Pennsylvania Law School, JD, magna cum laude

Order of the CoifComments Editor, University of Pennsylvania Law Review

Washington University, BA, college honors


  • Illinois
  • District of Columbia
  • Minnesota


  • US District Court for the Northern District of Illinois