Sectors
Eric Maassen headshot.

Eric L. Maassen

Partner

Eric L. Maassen is a partner in the Litigation Department of Foley & Lardner LLP. Eric focuses on the areas of environmental litigation and fiduciary litigation.

In the area of environmental litigation, Eric has litigated a broad range of disputes, including defense of air and water permits, CERCLA and common law contribution and cost recovery suits, RCRA claims, private contamination liability cases, natural resource damages suits, insurance coverage for environmental liabilities, and claims for consultant liability for regulatory advice. Eric also has represented clients in private landowner trespass and nuisance actions, including stray voltage suits.

Eric has represented clients in a variety of industries, including electric generation and distribution, petroleum pipelines, consumer kitchen products, electric motor manufacturing, metal recycling, automated assembly systems, heavy vehicles, paper manufacturing and distribution, medical diagnostics, chemical process modeling software development, and the airline industry.

Before joining Foley, Eric served as a judicial clerk to the Hon. Rudolph T. Randa, U.S. District Court, Eastern District of Wisconsin.

Experience Matters – Environmental Litigation

  • Defense of wetlands and waterways permit, water quality certification, and WPDES permit coverage for pipeline build project, including challenges to EIS, wetlands assessment and mitigation, and waterways crossings.
  • Successful defense of major source construction air permit under Prevention of Serious Deterioration provisions for new generation project consisting of seven natural gas-fired reciprocating internal combustion engines, before agency and state courts, including challenges to EIS and BACT analysis regarding hybrid battery energy storage systems. Published decision at Sierra Club v. Wisconsin Department of Natural Resources, Wisconsin Public Service Corporation and Wisconsin Electric Power Company, 2015 WI App 39.
  • Successful defense of WPDES permit for electric generation facility.
  • Representation of intervenor in a natural resource damages case brought by the State of Minnesota relating to perfluorochemicals in the Mississippi River.
  • Prosecution of RCRA and CERCLA action on behalf of industrial site owner and operator to require prior tenant and chemical distributor to rectify soil and groundwater contamination by chlorinated solvents and petroleum.
  • Representation of pulp and paper manufacturer in petition to United States Court of Appeals for the Eight Circuit challenging portion of federal implementation plan imposing sulfur dioxide BART limit under regional haze provisions of the Clean Air Act.
  • Representation of environmental response trust in prosecution and defense of CERCLA contribution and cost recovery actions, pertaining to military industrial complex near Las Vegas, Nevada.
  • Defense of pipeline company, and successful settlement achieved, in mass tort suit brought by more than 400 landowners arising out of a release of approximately 54,000 gallons of gasoline outside the town of Jackson, Wisconsin.
  • Defense of paper and personal care products manufacturer with respect to the Fox River Superfund Site in Wisconsin, one of the largest Superfund sites in the country, with clean-up estimate for the entire site at over $1 billion.
  • Representation of landfill site remediation group in CERCLA contribution actions and insurance coverage litigation.
  • Representation of metal recycler in engineering malpractice claim against consultant arising out of advice concerning MACT rules as applied to aluminum melting furnace.
  • Representation of landfill trust in relation to contributing responsible parties.
  • Representation of industrial companies against municipalities with respect to indemnity claims arising out of landfill contamination contribution suits.
  • Representation of frac sand mining venture against landowners with respect to reclamation matters.
A person writes a check with the word "donation" marked in the memo field, seeking advice from Chicago lawyers about proper charitable giving documentation.
February 12, 2026 Foley Viewpoints

Epstein Files Highlight Reputational and Legal Risks of Problematic Benefactors

The DOJ’s rolling disclosures of millions of pages of documents pertaining to the FBI’s investigation of Jeffery Epstein has captured the nation’s attention. It has also attracted the intense focus of charitable organizations who may have accepted or may be in the process of soliciting or taking major gifts from wealthy benefactors with ties to Epstein.
March 24, 2021 Foley Viewpoints

Fairbairn v. Fidelity Investments Charitable Gift Fund: Managing Contributions of IPO Stock Goes Awry, but Donors have Little Recourse

Donors make contributions to donor-advised funds (“DAFs”) for a variety of reasons. One is that DAF rules permit the donor to make the contribution in the current year, while retaining the ability to give the money to charities in future years.
The University of Missouri campus with a view of the historic red-brick building, iconic columns, and clear blue sky—an inspiring backdrop for those pursuing careers in intellectual property law.
February 5, 2021 Newsletters

Litigating Donor Intent: State ex rel. Board of Curators of University of Missouri v. Green

A recent case involving a gift to endow professorships shows the tension between principles of trust and contract in bequests—and how the difference can have unanticipated and important effects on how disputes are resolved.
September 23, 2019 In the News

Maassen Profiled in EDWBA Newsletter

Partner Eric Maassen, the new president of the Eastern District of Wisconsin Bar Association, was the subject of an article in the October 2019 issue of The Docket, the bar association’s monthly newsletter.
April 20, 2016 Newsletters

Wisconsin Broker-Dealers Will Owe Fiduciary Duties for Retirement Investment Advice

Wisconsin is home to over 10,000 registered broker-dealers, all of whom currently operate without owing federally imposed fiduciary duties.