John S. Hahn

Partner

T +1 202 263 3346

F +1 202 263 5346

John Hahn's practice encompasses a wide variety of environmental counseling and litigation matters. Often these have involved contaminated sites and issues of successor liability. He also has extensive experience with environmental challenges to real estate development and the allocation of environmental liabilities in corporate and real estate transactions. John received the Oak Leaf Award from The Nature Conservancy in 1991 for his pro bono work in support of TNC's conservation projects. He joined Mayer Brown as a partner in 2000.

Areas of Focus
- Banking & Finance
  - Leveraged Finance
  - Social Finance
- Energy
- Environmental
- Litigation & Dispute Resolution
Education
- Yale Law School, JD 1977
- Duke University, AB, magna cum laude 1974
Admissions
- North Carolina 2011
- District of Columbia 1977
- US Court of Appeals for the First Circuit 2007
- US Court of Appeals for the Eighth Circuit 1993
- US Court of Appeals for the Federal Circuit 1983
- US Supreme Court 1981
- US Court of Appeals for the District of Columbia Circuit 1978
- US District Court for the District of Columbia 1978
Activities
- Board of Visitors, Nicholas School of the Environment, Duke University
- American Bar Association, Section of Environment, Energy and Resources
Languages Spoken
- English

Mayer Brown is a global legal services provider comprising legal practices that are separate entities (the “Mayer Brown Practices”). The Mayer Brown Practices are: Mayer Brown LLP and Mayer Brown Europe – Brussels LLP, both limited liability partnerships established in Illinois USA; Mayer Brown International LLP, a limited liability partnership incorporated in England and Wales (authorized and regulated by the Solicitors Regulation Authority and registered in England and Wales number OC 303359); Mayer Brown, a SELAS established in France; Mayer Brown JSM, a Hong Kong partnership and its associated entities in Asia; and Tauil & Chequer Advogados, a Brazilian law partnership with which Mayer Brown is associated. “Mayer Brown” and the Mayer Brown logo are the trademarks of the Mayer Brown Practices in their respective jurisdictions.

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John S. Hahn

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