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.