Mark Deem > Cooley (UK) LLP > London, England > Lawyer Profile

Cooley (UK) LLP

Living Wage

Mark Deem photo

Work Department

Antitrust Litigation
Artificial Intelligence
Aviation - Manned & Unmanned
Commercial Litigation
Digital Media & Entertainment
International Commercial Arbitration
Internet & Social Media


Mark Deem is partner in Cooley’s London office and a commercial litigator, with considerable experience of complex domestic and cross-border litigation, international arbitration and regulatory matters. He has conducted litigation in all commercial divisions of the English High Court, Court of Appeal, Supreme Court and Court of Justice of the EU; represented clients in international arbitration proceedings under the rules of the ICC, LCIA, RIDR and IFTA; and has a broad experience of mediation and other dispute resolution mechanisms.

He is a solicitor-advocate, with rights to appear in all courts in England and Wales and has considerable experience of managing clients’ exposure to the risk and cost of commercial disputes, through the innovative use of ATE insurance, third party and other litigation-funding arrangements.

Mark focuses on technology, media and telecommunications (TMT) litigation, contentious privacy, data protection and cybersecurity issues and financial services disputes. He has particular experience in a variety of industry sectors, including aviation and aerospace, communications, digital, TMT and banking and finance.



Society for Computers & Law


College of Law, Guildford
LPC, 1998
Downing College, Cambridge
MA, 1997

Lawyer Rankings

London > TMT (technology, media and telecoms) > IT and telecoms

Cooley (UK) LLP is instructed by established and fast-growing, emerging companies on corporate and private equity transactions in the technology sector; it also has particular expertise advising on open source software matters. Chris Coulter heads up the practice and has experience in technology, data, cybersecurity, contractual and IP issues; other names to note include Ryan Naftulin, who assists companies and investors which are forming and financing disruptive high-growth companies, and litigator Mark Deem.

London > Dispute resolution > Commercial litigation

Cooley (UK) LLP‘s ‘commercial litigation team is second to none in terms of knowing its clients’ business and giving targeted advice‘. The London litigation team’s work is international and frequently multi-jurisdictional, and it covers asset recovery, employment, general commercial disputes, insolvency, insurance and reinsurance, life sciences, product liability, public international law, technology disputes and IP. James Maton heads the UK disputes practice, Laurence Harris  is vice chair of the global litigation department and Rod Freeman is an experienced product litigation lawyer. Also key to the group are Kevin Perry and Mark Deem. Sascha Grimm and Henry Stewart have been promoted to partner.

London > Dispute resolution > International arbitration

Cooley (UK) LLP‘s ‘practice group comprises individuals who work strongly together as a team to produce meaningful results‘. Its key strengths are international commercial (particularly oil and gas exploration matters) and investment treaty arbitrations, as well as insurance and reinsurance-related arbitrations. James Maton heads the London litigation team, which also includes Mark EverissMark Deem and Laurence Harris, along with David KendallKevin Perry and special counsels Christophe Bondy and Joshua Brien. Henry Stewart was promoted to partner, while James Crabtree left for Keystone Law.