Philip J.Devenish


London + 44.20.7039.5531

Philip Devenish provides counsel and strategic advice in international disputes. In recent years he has won billions of dollars for clients in high-profile cases all over the world. Legal directories describe him as "an outstanding lawyer" (Who's Who Legal) who is "widely praised by peers and clients" (Expert Guides), "extremely impressive" (Chambers), "extremely sharp" (International Financial Law Review), and "thorough and unflappable — destined to do great things in the field" (The Legal 500).

Philip has handled some of the largest and most important international cases of the past decade, as ranked by The American Lawyer and Global Arbitration Review. Among other successes, he served on the trial team that secured a US$1.3 billion award for a major commercial bank in a politically charged dispute originating in Eastern Europe. He is presently counsel of record in a US$2 billion arbitration arising out of the Qatar diplomatic crisis.

Philip also has significant experience in defending against politically sensitive investigations and prosecutions by foreign governments. He regularly acts for corporates and ultra-high-net-worth individuals (UHNWIs) facing allegations of financial wrongdoing, including fraud, money laundering, corruption, and bribery.

Philip is ranked among the world's leading practitioners in global disputes and has received various accolades for his work. In 2020 he received the International Financial Law Review's Europe Award for Commercial Arbitration in recognition of his "lead role in some of the world's largest international arbitrations."


  • PTTGC acquires allnex from AdventJones Day advised PTT Global Chemical Public Company Limited in the €4 billion acquisition of allnex Holding GmbH from Advent International.
  • Clients seek advice in connection with criminal investigation and potential criminal and civil claims relating to alleged fraud of over US$1 billionJones Day is advising clients in connection with a criminal investigation and potential criminal and civil claims relating to an alleged fraud of over US$1 billion.
  • Saudi businessman brings investment arbitration proceedings against Middle Eastern stateJones Day represents a Saudi Arabian businessman in investment arbitration proceedings against a Middle Eastern state.
  • Windoor arbitrates ICSID claim against KazakhstanJones Day is representing Estonian construction company AS Windoor in ICSID arbitration proceedings against the Republic of Kazakhstan.
  • U.S. healthcare company arbitrates ICC claim against Middle Eastern hospital proprietorJones Day is representing a Pittsburgh-based international healthcare management and consulting company in an ICC commercial arbitration against an owner of medical centers and clinics in the Middle East.
  • Canadian mining company initiates UNCITRAL arbitration against KazakhstanJones Day represents a Canadian mining company in an UNCITRAL arbitration against the Republic of Kazakhstan.