Oonagh Sands > Fietta LLP > London, England > Lawyer Profile

Oonagh Sands

+44 (0)203 889 9793 oonagh.sands@fiettalaw.com View profile View profile

Position

Oonagh Sands is a dually-qualified English and US lawyer: she is an English-qualified Solicitor and Solicitor-Advocate (Higher Courts Civil Proceedings), as well as an Attorney in New York State and the District of Columbia. The Legal 500 has recognised Oonagh as a “Rising Star” in public international law.

She has significant experience representing sovereign States and their State-owned entities, as well as individuals and private entities, before leading world dispute resolution fora. Oonagh has represented clients before the International Court of Justice, the Permanent Court of Arbitration, as well as investor-State arbitral tribunals constituted under ICSID, ICSID Additional Facility, UNCITRAL, SCC and ICC Rules. Oonagh has also advised sovereign States, State-owned entities, and private entities on the law of sovereign immunity and the recognition and enforcement of arbitral awards under English law. She has counselled States on territorial and maritime boundary disputes, the law of State responsibility, treaty interpretation, international environmental law, and the law of the sea. Oonagh has also delivered several training courses to officials of State clients on international law of the sea and public international law more broadly.  In addition, Oonagh has represented clients in international commercial arbitration proceedings conducted under ICC, LCIA, SCC and UNCITRAL Rules, as well as multiple domestic proceedings before English and U.S. federal courts.

Oonagh has taught aspects of international law of the sea on a Master’s programme at King’s College London and at the International Foundation for the Law of the Sea Summer Academy in Hamburg; she has also guest lectured on investment treaty arbitration at Pepperdine University. In addition, Oonagh sits on the faculty of the London Institute of Space Policy & Law.  In May 2020, the American Society of International Law appointed Oonagh to serve on its Program Committee, alongside prominent US academics and international law practitioners. Oonagh has served on ASIL’s Steering Committee for its signature topic, “Beyond National Jurisdiction: Human Activities in the Oceans, Polar Regions, Cyberspace and Outer Space”, following her tenure as elected Co-Chair of the Society’s ‘Space Law Interest Group’. In 2016, Oonagh was recognised by the Irish Times for women’s influence in global public affairs.

Prior to joining Fietta, Oonagh worked at major law firms in Washington DC and London. Oonagh has worked for the United Nations Office of Legal Affairs in New York, the European Commission in Brussels, and the Institute of International Economic Law at Georgetown University Law Center in Washington DC.

Career

Fietta LLP, Partner (2024-onward), counsel (2020-2024), senior associate (2018-2020), consultant (2017-2018); Foley Hoag LLP, associate and senior associate (2011-2017); United Nations, Office of Legal Affairs, researcher (2010); Matrix Chambers, research assistant to Prof. Philippe Sands QC (2009-2010); King & Wood Mallesons, trainee and associate (2004-2009); Center for Strategic & International Studies, research assistant (2003-2004); Georgetown University Law Center, Institute of International Economic Law (2003); European Commission (2003)

Languages

English (native), French and Spanish

Education

Solicitor-Advocate in England & Wales (Higher Courts Civil Proceedings) (2022)

Admitted to practise in the District of Columbia, USA (2014)

LLM Public International Law (2009-2010), University College London

Admitted to practise in England & Wales (2006)

Admitted to practise in the State of New York, USA (2005)

LLM General Legal Studies (2002-2003), Georgetown University Law Center

Postgraduate Diploma EC Competition Law (2001-2002), King’s College London

French Civil Law (1999-2000), Université de Bourgogne

LLB (Jt. Hons) Common & Civil Law with French (1997-2001), Queen’s University Belfast