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Mayer Brown

1999 K STREET, NW, WASHINGTON, DC 20006-1101, USA
Work +1 202 263 3000
Fax +1 202 263 3300

Dan Himmelfarb

Work +1 202 263 3035
Mayer Brown

Work Department



Dan Himmelfarb is a partner in Mayer Brown’s Washington DC office and a member of the firm's Supreme Court & Appellate practice. He is co-leader of Mayer Brown's Washington DC Litigation practice. Dan has filed more than 200 merits and petition-stage briefs in the US Supreme Court and has argued 40 cases in nine different appellate courts, including 12 in the US Supreme Court and 13 in the Second Circuit. Dan has particular experience in the areas of torts, administrative law, criminal law, constitutional law and statutory interpretation. Before joining Mayer Brown in 2007, Dan served for five years as an Assistant US Attorney in the Southern District of New York and then for five years as an Assistant to the US Solicitor General. In 2005, he received the US Attorney General’s Distinguished Service Award. Before joining the Department of Justice, Dan was in private practice for three years in New York. Prior to that, he had judicial clerkships with Judge J. Michael Luttig of the US Court of Appeals for the Fourth Circuit and Associate Justice Clarence Thomas of the US Supreme Court.


Yale Law School, JD, 1991; Senior Editor, Yale Law Journal Princeton University, AB, magna cum laude, 1987

United States: Industry focus

Environment: litigation

Within: Environment: litigation

Mayer Brown’s ‘highly intellectual’ team provides ‘great counseling on strategy and risk management’ on high-stakes cases involving torts relating to greenhouse-gas emissions, site-based mass tort claims, issues of first impression under CWA, challenges to EPA regulations under CAA, criminal environmental prosecutions, renewable energy projects, and complex environmental cleanup projects involving the application of remediation technologies. Examples include its continued representation of several industry groups in litigation attempting to prevent the enactment of certain regulations contained within the CWA, and representing Weyerhaeuser Corporation before the Supreme Court in a case brought by the Fish and Wildlife Service under ESA alleging 1,500 acres of private timberland as critical habitat for the dusky gopher frog; the ‘fabulousTimothy Bishop leads both cases from Chicago. He is ‘the name to call if you have environmental litigation before the Supreme Court’. In Washington DC, John Hahn is a ‘great analyst and problem solver, excellent draftsman, and fun to work with’; counsel Roger Patrick has ‘a tremendous ability to dig deep into the law and facts to build a compelling case’; ‘brilliant' Dan Himmelfarb is ‘a winner’. Other names to note are Chicago-based Rich Bulger and Mark Ter Molen, who jointly co-chair the environmental practice.

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