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Nancy Lesser is the principal of Pax ADR in Washington DC, and brings over 25 years of experience as a neutral to her dispute resolution practice.  Prior to establishing her own  firm, she was a partner with the distinguished law firm of Williams & Connolly, where she specialized in litigating complex commercial cases nationwide.


 Ms. Lesser's practice is now limited to arbitration. She serves as an arbitrator on the Large, Complex Commercial Disputes Arbitration Panel of the American Arbitration Association; the Panel of Neutrals for the American Health Lawyers Association; and the Panel of Distinguished Neutrals for the Commercial, Banking, Accounting, Financial Services, and Real Estate Panels of the CPR Institute for Dispute Resolution. She is the standing chair of the National Arbitration Panel, which hears disputes nationwide between Amtrak and freight railroads. She is a  Fellow of the College of Commercial Arbitrators.


Ms. Lesser has served as a neutral in hundreds of arbitrations covering a broad range of subject areas, from contract and securities cases, copyright, patent and other intellectual property disputes, transportation and insurance coverage claims. Click each heading for a list of representative cases.  

View a comprehensive list of Ms. Lesser's experience here.


Ms. Lesser has served as arbitrator in hundreds of complex commercial arbitrations, both domestic and international, involving multi-million dollar claims. She has presided as chair of numerous arbitration panels, and has also served frequently as sole arbitrator and neutral wing. Ms. Lesser has a broad range of arbitration experience, from legal and accounting malpractice, contract and securities cases, corporate and partnership disputes, intellectual property claims, software development and other technology disputes, and insurance coverage claims.  For more details about Ms. Lesser’s experience, see practice areas.

Arbitrator Retainer Agreement

Arbitration Scheduling Order Template

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2101 L Street, NW, Suite 300, Washington, DC 20037​


Phone: (202) 775-8100
Fax: (202) 318-0203



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