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Dan Cantor combines his dual training and experience as a litigator and environmental lawyer into a broad-based practice focused on all manners of complex litigation. Among other things, he has represented clients in allocation proceedings, business loss claims, indemnity disputes, contract disputes, environmental matters, antitrust matters, property damage disputes, and intellectual property matters. He regularly works with leading economists, accountants, statisticians and other expert witnesses in analyzing and presenting testimony on causation, damages, valuation, and other issues. Mr. Cantor has significant experience defending against and resolving putative class actions. He litigates in a variety of different fora, including federal and state courts, administrative tribunals, and arbitrations.

His environmental practice is focused on resolving disputes concerning environmental liabilities, as well as proactively managing and reducing potential liabilities. Mr. Cantor frequently handles and litigates disputes among past and current business and property owners concerning environmental liabilities. Such disputes often involve the interplay of contractual agreements (i.e., divestiture and indemnity agreements) and public laws. He also regularly represents clients in a variety of alleged business losses, diminished value, property damage, toxic tort and spill disputes, and has significant experience opposing efforts to certify classes as well as structuring class action settlements. He has designed and overseen claims facilities for resolution of large numbers of claims following environmental incidents, and has represented clients in federal and state congressional inquiries and hearings, as well with public relations matters associated with environmental incidents and mass torts.

Mr. Cantor also works with clients to manage and reduce potential liabilities. He frequently represents developers, buyers, sellers, lessees, lessors, lenders, and borrowers with regard to environmental issues arising in all forms of real estate and corporate transactions. He has significant experience in drafting and negotiating contracts that allocate environmental liabilities, as well as negotiating and drafting environmental insurance policies and third-party risk transfer and guaranteed fixed price agreements.

Prior to joining the firm, Mr. Cantor clerked for the Honorable Christine O.C. Miller of the Court of Federal Claims.


  • BP, as lead counsel, with regard to business and individual claims arising from Deepwater Horizon spill. Litigated thousands of claims in multiple dispute resolution forums involving alleged lost profits, diminished value, and property damage.
  • Major League Baseball, as lead counsel, in trial and appellate proceedings concerning the allocation of statutory royalties paid for the retransmission of broadcast signals.
  • Energy company, as lead counsel, in defense of indemnity claims arising from divesture of refinery.
  • Lead defense counsel in federal court litigation concerning environmental indemnity claims for six divested industrial facilities.
  • Large industrial manufacturer, as lead counsel, in appeal of multimillion dollar award of statutory attorneys' fees. Appellate court vacated fee award as excessive and unsupported.


Bloomberg Law
Pro Bono Innovator (2022)
The Legal 500 US
Sport (2021-2022)
District of Columbia Bar Association
Laura N. Rinaldi Pro Bono Lawyer of the Year (2021)



  • J.D., American University, Washington College of Law, 1996, summa cum laude
  • B.A., Bates College, 1992, Phi Beta Kappa, high honors


  • District of Columbia
  • Maryland


  • U.S. Court of Federal Claims, The Honorable Christine OC Miller


  • Chair, Arnold & Porter Pro Bono Committee
  • Actively involved in pro bono matters in areas of housing, public benefits and civil rights