Matrix Chambers

Practice Areas

Specialist in extradition, mutual legal assistance, and international criminal law. Regularly instructed to advise and appear on behalf of individuals and foreign governments in proceedings in the United Kingdom and abroad. Prior Chair of the Extradition Lawyers’ Association. Caseload has included ● Julian Assange ● USA v Mike Lynch (sale of Autonomy to Hewlett Packard) ● India v Vijay Mallya (collapse of Kingfisher Airlines) ● USA v Sarao (2010 “flash crash)  ● USA v Pearse (Mozambique “tuna bond” fraud) ● collapse of Enron (the “NatWest 3”) ● attempted Regicide ● Madrid train bombings ● murder of Theo van Gogh ● hacking into the Pentagon and Pearl Harbour and NASA computer networks. Mark’s domestic criminal practice focuses on anti-terrorism, national security, and cases concerning complex cross-border and jurisdictional issues. Recent caseload has included ● Russian spy ring ● Elgizouli ● Anjem Choudary ● 1982 Hyde Park IRA bombing.

Publications

Co-author: "The Law of Extradition and Mutual Assistance" (OUP, 4th ed., 2025), “Abuse of Process in Criminal Proceedings” (Bloomsbury, 4th. ed., 2014); “Human Rights and Criminal Justice” (Sweet & Maxwell, 3rd ed., 2012).