John S. Hahn: Lawyer with Mayer Brown LLP

John S. Hahn

Washington,  DC  U.S.A.
Phone+1 202 263 3346

Peer Rating

Client Rating

Printer Friendly VersionEmail this PageDownload to My Outlook ContactsAdd lawyer to My FavoritesCompare this lawyer to other lawyers in your favorites

Experience & Credentials

Practice Areas

  • Banking & Finance
  • Leveraged Finance
  • Social Finance
  • Energy
  • Environmental
  • Litigation & Dispute Resolution
Contact InfoTelephone: +1 202 263 3346
Fax: +1 202 263 5346
University Duke University, A.B., magna cum laude, 1974
Law SchoolYale Law School, J.D., 1977
Admitted1977, District of Columbia; 1978, US District Court for the District of Columbia; 1978, US Court of Appeals for the District of Columbia Circuit; 1981, US Supreme Court; 1983, US Court of Appeals for the Federal Circuit; 1993, US Court of Appeals for the Eighth Circuit; 2007, US Court of Appeals for the First Circuit; 2011, North Carolina


Board of Visitors (Emeritus), Nicholas School of the Environment, Duke University

American Bar Association, Section of Environment, Energy and Resources

NC Bar Association, Environment, Energy & Natural Resources Law Section


John Hahn's practice encompasses a variety of high-stakes environmental counseling and litigation matters. These have involved defense against Federal and state enforcement actions and challenges to rulemaking authority, as well as private-sector disputes over contaminated sites and issues of successor liability. He 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.

Profile Visibility
#3,361 in weekly profile views out of 59,045 lawyers in Washington, District of Columbia
#111,660 in weekly profile views out of 1,694,340 total lawyers Overall

Office Information

John S. Hahn

1999 K Street, N.W.
WashingtonDC 20006-1101


Professional Networking for Legal Professionals Only

Quickly and easily expand your professional
network - join the premier global network for legal professionals only. It's powered by the
Martindale-Hubbell database - over 1,000,000 lawyers strong.
Join Now