Mark McCloskey is an associate in the firm’s International Dispute Resolution Group, resident in the London office.
Mr. McCloskey’s practice includes contentious and advisory work on a range of complex international law issues, including in international investment and commercial arbitration, public international law, commercial litigation and human rights. He is recommended by The Legal 500 UK, where clients note he is “a hard-working, intelligent associate,” with “excellent legal skills” and a “commitment with human rights.”
Mr. McCloskey has advised clients in various industries, including energy and natural resources, infrastructure, insurance, aviation and financial services, under the ICC, ICSID, LCIA, SIAC and UNCITRAL rules, and before domestic courts. He has also advised investment firms and asset managers in evaluating investments in international claims or arbitration awards.
Mr. McCloskey’s representations in the Courts of England & Wales include disputes raising complex issues of private international law and corporate social responsibility. He has acted on cases at all levels of the court system, including before the UK Supreme Court.
Mr. McCloskey has an active pro bono practice, focused on public international law issues, including human rights claims brought before UN human rights treaty bodies, domestic courts and other international human rights bodies. His representations in this space include a successful intervention before the UK Supreme Court concerning Northern Ireland’s abortion laws and multiple complaints to the UN Human Rights Committee concerning sexual and reproductive violence. He has also received an International Bar Association Group Member Award for his involvement in the roster of lawyers supporting the IBA’s eyeWitness project, an initiative which harnesses the power of technology to help bring to justice those enabling and encouraging unspeakable cruelty.
Mr. McCloskey speaks and writes on international law issues, including recently: “Chronicle 2024 on European Law and Arbitration Developments,” European Investment Law and Arbitration Review (2025); “Dyson Decision Highlights Post-Brexit Forum Challenges,” Law360 (2023); “UK courts continue to clarify the basis and scope of ‘representative actions’,” International Bar Association (2021); “The 2020 revisions to the IBA rules on evidence – change for a new decade,” Global Arbitration Review (2021); and “Safe Haven for Investors in (and Through) the UK Post-Brexit?” American Society of International Law Insights (2021). He is an editor of the European Investment Law and Arbitration Review, co-published by the European Federation for Investment Law and Arbitration and Queen Mary University of London. He sits on Arbitration Ireland’s Young Practitioners Committee and is a former member of the Executive Committee of the London Irish Lawyers Association.
Mr. McCloskey is admitted as a Solicitor Advocate of the Senior Courts of England & Wales. He speaks and handles matters in Spanish.