Duncan Speller

Duncan Speller is co-chair of the International Disputes Division of Duane Morris’ Trial Practice Group, representing clients in high-value and complex international arbitration and English High Court litigation.

He represents clients in ad hoc and institutional arbitrations. Mr. Speller has participated in arbitrations sited in civil and common law in England, New York, Hong Kong, Singapore, Dubai, France, Switzerland, Sweden, Denmark, Austria and Germany.

Mr. Speller works with clients in the aviation, oil and gas, mining and resources, insurance and reinsurance, private equity, telecommunications, technology, banking industries. He has represented companies in matters regarding transfer fees, production sharing contracts, mergers and acquisitions, aircraft lease agreements and competition law.

He has served as an arbitrator and as an emergency arbitrator for numerous institutions. He is ranked by Chambers UK (2025-2026) and Chambers Global (2024) for International Arbitration, and the Legal 500 UK (2025) also recognized him as a “Leading Individual.” Clients reported to Chambers that he has "flawless judgement and a very enviable work ethic" and is "very persuasive, tactical and is a great presenter."

Mr. Speller earned his B.C.L. from the University of Oxford.