Jeffrey was appointed joint Head of Chambers with Simon Davenport QC in April 2018.
Jeffrey is a specialist arbitrator, mediator and expert with broad experience of a wide range of capital markets matters, including swaps and derivatives, international equity and debt offerings, US private placements and listings, and mergers, acquisitions and joint ventures. He has acted extensively for the International Swaps and Derivatives Association (ISDA), was a principal author of ISDA’s master agreements and has appeared as an arbitrator and as expert witness in several high profile derivatives cases. He was formerly the founding partner of the US law practice at Allen & Overy LLP and senior partner in the firm’s global derivatives practice. Before joining Allen & Overy as a partner in 1994, he practiced for more than 15 years in the New York and London offices of the leading Wall Street firm of Cravath, Swaine & Moore.
He serves currently as Chairman of The P.R.I.M.E. Finance Foundation in The Hague and is a member of the Foundation’s Panel of Recognised International Market Experts in Finance. He is also a Governor and Honorary Fellow at the London School of Economics and Political Science, where he previously held an appointment as Visiting Professor.
Jeffrey recently featured in the Legal 500's inaugural International Arbitration Powerlist UK of leading arbitration practitioners on page 50-51.
Honorary Bencher, Honorable Society of Middle Temple
Honorary Fellow, London School of Economics and Political Science Governor, London School of Economics and Political Science.
Visiting Professor in the Law Department at the London School of Economics and Political Science (2010-2013)
Former Chairman of the LSE Alumni Association (2011-2013)
Chairman of P.R.I.M.E. Finance Foundation in The Hague. Former Chairman of the Society of English and American Lawyers (SEAL).
Former Chairman of the American Bar Association (ABA) Section of International Law, Co-Chairman of its Financial Engineering for Economic Development (FEED) and International Criminal Court Task Forces and a former Co-Chairman of its International Securities and Capital Markets and U.S. Lawyers Practicing Abroad Committees.
Section Delegate, ABA House of Delegates Served on ABA Commission on Ethics 20/20 and the Steering Committee of the ABA/UNDP International Legal Resource Center
Life Fellow and International Co-Chairman of the American Bar Foundation. Elected Member, American Law Institute (ALI).
Admitted to practice in the State of New Jersey (1978), the State of New York (1979), and before the Supreme Court of the United States (1983).
Jeffrey is General Editor of the Capital Markets Law Journal (Oxford University Press), a leading OUP journal in this field, and has published and lectured widely himself.
Jeffrey, his projects and his legal teams have received numerous awards, and he has topped the rankings for derivatives lawyers and drawn accolades from all leading law firm directories, including, among others, having been hailed as "Mr Derivatives" (Chambers) and "legendary" (Legal 500) and credited with having "written the law on derivatives" (Legal 500).
He is listed in Best Lawyers (United Kingdom Edition).