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 ADR firm, she was a partner with the distinguished law firm of Williams & Connolly, where she specialized in litigating complex commercial cases nationwide.


Ms. Lesser 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,  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 also a  Fellow of the College of Commercial Arbitrators.

Fortune 500 companies, small businesses, federal and state agencies, and individuals look to Ms. Lesser for an efficient process to resolve their disputes without incurring the expense, frustration, and delay of traditional litigation.  View her complete CV.  



Ms. Lesser has mediated and arbitrated over a thousand cases and has a broad range of dispute resolution experience, from contract and securities cases to copyright, patent and other intellectual property disputes 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 handled a wide variety of commercial arbitrations involving multi-million dollar claims. She has served as chair on numerous panels and has also served as a sole arbitrator and a wing in many other matters. Ms. Lesser has a broad range of arbitration experience, from legal and accounting malpractice, contract and securities cases, corporate and partnership cases, 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



Ms. Lesser has been helping parties resolve seemingly intractable disputes for over twenty years. She has mediated hundreds of complex business claims, in cases as diverse as an accounting dispute between a major city and an electrical utility; a 20-year class action between a federal employee union and the United States; False Claims Act qui tam actions and Sarbanes Oxley whistleblower cases; hundreds of breach of contract suits; wrongful death and personal injury claims; trademark, copyright and patent disputes involving industries as diverse as lighting, food products, medical devices, sound systems and software. For more details about Ms. Lesser’s experience, see practice areas.

Mediation Retainer Agreement

Mediation Submission Checklist

Med/Arb Agreement



Ms. Lesser has handled hundreds of challenging disputes as a mediator and arbitrator.  She was named one of the  "Alternative Dispute Resolution Champions" in 2016 and 2017 by the National Law Journal. The Washington Legal Times has named her “Best Individual Mediator” and she is consistently listed as one of Washingtonian Magazine's "Best Mediators."






2101 L Street, NW, Suite 800, Washington, DC 20037​


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