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Angeline specialises in international arbitration and public law. Her arbitration practice includes commercial and investment treaty claims.

Angeline is a co-chair of the IBA Arb 40 Subcommittee and contributed to the 24th Edition of Russell on Arbitration, the leading textbook on arbitration in English law. She is recommended as a leading expert in arbitration by Who’s Who Legal 2016, and has been consistently recognised as a leading individual for arbitration and public law by the legal directories.

Prior to joining Matrix, Angeline was Counsel and Solicitor Advocate in the International Arbitration Group at Allen and Overy LLP, spending time in the London and Hong Kong office and on secondment to the LCIA. She has worked with counsel in a wide range of jurisdictions including India, Myanmar, Indonesia, Belize, Hong Kong, Turks & Caicos Islands, Singapore, United States, Kazakhstan, Rwanda and various European states.

Angeline has four core areas to her practice:

Commercial arbitration: Angeline has acted as counsel in a range of complex arbitrations under a range of arbitral rules. Her practice includes commercial arbitration across a range of sectors (including construction, energy, financial and telecoms disputes). She has particular expertise in emerging market jurisdictions and in handling commercial disputes against states.

Investment treaty arbitration: Angeline has acted as counsel in investment treaty claims and regularly advises on the structuring of investments in order to gain investment treaty protection. She recently led the team advising on three investment treaty claims against the Government of Belize arising out of the nationalisation of Belize Telemedia Limited which successfully settled.

Public law and constitutional claims: Angeline advises on a wide range of public law issues. She has acted on judicial review and constitutional challenges before the English courts as well as courts elsewhere in the Commonwealth, including the English Supreme Court, the Privy Council and the Caribbean Court of Justice.

Court applications related to arbitration: Angeline has particular expertise in this area. She has advised on a range of court applications related to arbitration, including anti-suit injunctions, interim relief in support of arbitration and enforcement of arbitral awards. She acted on two of the leading arbitration cases in recent years; AES Ust- Kamenogorsk v UST-Kamenogorsk JSC [2013] UKSC 35 (a leading case on anti-suit injunctions in support of an arbitration) and Jivraj v Hashwani [2011] UKSC 40 (concerning whether an arbitration agreement which specified that arbitrators must be of a particular religious faith was contrary to discrimination legislation and therefore unlawful, a case which had broader implications for the validity of arbitration clauses which commonly include nationality requirements).

Angeline accepts instructions under the Bar Council Standard Contractual Terms, details of which can be found here.


Chambers UK 2016 (International Arbitration) “Angeline Welsh is “immensely helpful,” according to clients, due to her “ability to put herself in the client’s situation when problem solving.” Her practice is predominantly focused on Central American and Caribbean disputes.”

Chambers UK 2015 (Administrative & Public Law) “Angeline Welsh is an associate with growing expertise in the overlap between international arbitration and domestic public law. She has advised on judicial reviews in the Supreme Court and the Privy Council. Sources laud her as “a bit of a star. She’s a very good litigator with inexhaustible energy.”

Chambers UK 2014 (International Arbitration) “Of counsel Angeline Welsh advises on commercial arbitrations, investment treaties and anti-suit injunctions. She has recently acted on a significant dispute concerning production sharing contracts in the oil and gas industry. Her peers describe her as “incredibly bright, razor-sharp, and very knowledgeable about arbitration.”

Chambers UK 2013 (International Arbitration) “The “really excellent” Angeline Welsh continues to attract praise for her expertise in international arbitration, and offers experience in both advising and advocating under a range of arbitral rules. She has a well-respected practice focusing on disputes against states.”

Chambers UK 2013 (Administrative & Public Law) “Senior associate Angeline Welsh receives strong plaudits for her knowledge of public and constitutional law in an international context. According to one appreciative client: “She has a very practical approach to things. She is straight to the point and that is why she is so successful.”