MAJ Gabrielle Sleeman

MAJ Gabrielle Sleeman is a British Army Legal Services officer on an exchange posting as an assistant professor in the Department of Law & Philosophy at the United States Military Academy (USMA). She teaches international law.

Graduating from the University of Sheffield with a bachelor’s degree in law, she completed her postgraduate study at the Inns of Court School of Law at City University and BPP University. MAJ Sleeman was “called to the bar” at Gray’s Inn in 2007 and admitted to the roll of solicitors in 2011. She was commissioned from the Royal Military Academy Sandhurst in 2012 as a captain in the Army Legal Services.

Immediately following commissioning, MAJ Sleeman was deployed on the United Nations mission in Cyprus to assist with maintaining the buffer zone between the Turkish Republic of Northern Cyprus and Cyprus.

In October 2016, she was appointed to deliver operational law training as part of a multinational short‑term training force, teaching the law of armed conflict to legal advisers within the Ugandan Peoples’ Defence Force in Uganda and to Gurkha soldiers based in Brunei.

Following promotion, MAJ Sleeman was the only legal adviser to the 77th Brigade, a United Kingdom specialist unit delivering information activities and human security subject matter experts supporting more than 20 ongoing operational activities across the breadth of Army and joint activity.

In addition to her teaching commitments at USMA, she is completing her academic studies - a research master’s degree from the University of Reading exploring the challenges of complying with legal obligations during an international armed conflict within a congested civilian digital environment, and how an increasingly digitally enhanced military may effectively and lawfully operate in such a battlespace.