Three Crowns partners, Reza Mohtashami QC and Kathryn Khamsi, and counsel, Leilah Bruton, will participate in an AIPN webinar on “Disputes Under PSCs – Lessons Learned.” The webinar will provide a disputes-based perspective on the negotiation of PSCs and will consider key provisions that are commonly included in PSCs and frequently invoked in disputes between international oil companies and states or state-owned entities. Alongside other disputes and oil and gas experts, Reza, Kathryn, and Leilah will provide a series of practical considerations and recommendations to inform the negotiation of PSCs. The panel discussion will be followed by a Q&A.

The webinar will take place on Thursday, 13 May, at 4:00 pm – 6:00 pm GMT. This event is organised by the Canada Chapter of the AIPN and sponsored by Three Crowns.

For more information and to register, please click here.


Reza, a partner in the London office, has represented clients as counsel and advocate in more than 80 arbitrations conducted under a variety of arbitration rules in many different jurisdictions. He has particular expertise in disputes arising in emerging markets.

Reza is a qualified English Solicitor-Advocate and was appointed Queen’s Counsel in recognition of his advocacy skills in 2018.  He is Vice-Chair of the IBA Arbitration Committee, trustee of the DIFC-LCIA Arbitration Centre, member of the LCIA Court, and an editorial board member of the ICC Dispute Resolution Bulletin and Global Arbitration Review.


Kathryn, a partner in the Paris office, acts for states and corporate clients in all types of disputes, including investment treaty and commercial.  Clients have commended Kathryn’s “grasp of the technical detail, and her ability to identify and articulate game-changing arguments.”  She is recommended by Who’s Who Legal and The Legal 500. Kathryn was recently appointed to the ICSID Panel of Arbitrators for Bahrain and will serve a six-year term.


Leilah, counsel in the London office, has extensive experience representing corporations on resolving complex disputes involving investment treaties and contractual relationships. She focuses on oil and gas disputes arising out of long-term production sharing agreements and has represented corporations in disputes under all major arbitration rules.

Leilah is recognised by Who’s Who Legal as a “Future Leader” in arbitration and as a “Rising Star” in international arbitration in The Legal 500 UK – 2021 Guide.

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