Courtney has developed a broad practice in commercial litigation, international arbitration and public international law. Courtney is instructed on a broad spectrum of litigation in the English courts and in international arbitrations under a variety of institutional rules, and she regularly advises the UK Government on a range of public international law issues.
Courtney is also an expert on INTERPOL. She is the co-author of the leading text on INTERPOL, The Legal Foundations of INTERPOL (2nd edn, 2020), advises States on INTERPOL matters, and is well-versed in challenging INTERPOL red notices.
Before joining Twenty Essex, Courtney qualified as a solicitor-advocate and worked at a leading Wall Street firm. Courtney was also an Assistant Legal Adviser at the UK Foreign, Commonwealth & Development Office, where she advised on urgent issues arising in the context of the COVID-19 pandemic. Courtney also served as a Judicial Assistant to Lord Hodge and Lord Lloyd-Jones at the Supreme Court of the United Kingdom, where she worked on over 40 cases including, R v Reeves Taylor  UKSC 51, R (Privacy International) v Investigatory Powers Tribunal  UKSC 22, Vedanta v Lungowe  UKSC 20, and Elgizouli  UKSC 10.Privacy notice