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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 ‘service is extremely good’. The team acts in high-stakes matters, such as air enforcement cases involving the CAA New Source Review program, criminal environmental prosecutions, and major development projects. It represented several industry groups in challenging the legality of the EPA’s new regulation defining the waters of the US. The team also defended CSX Transportation in several environmental tort lawsuits that alleged personal injuries and property damage resulting from the 2012 derailment of a Conrail train. The practice’s co-chairs are Chicago-based Richard Bulger, who acts for clients in the chemical, utility, scrap metal, railroad, and ranching industries, and Mark Ter Molen, whose experience includes toxic tort trials and appeals, as well as putative class actions. Also in Chicago, Timothy Bishop has substantial experience in environmental and land use litigation; in Washington DC, ‘the extremely knowledgeableJohn Hahnalways has the client’s best interests at heart’; and Dan Himmelfarb and Evan Tager, and counsel Roger Patrick, are also widely praised.

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