Mark Summers KC

Ranked in 2 Practice Areas

Star Individuals

Extradition

London (Bar)

13 Years Ranked

Band 1

Crime

London (Bar)

22 Years Ranked

About

Provided by Mark Summers KC

UK Bar

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).

Chambers Review

Provided by Chambers

UK Bar

Extradition - London (Bar)

Star Individuals

Individual Editorial

Mark Summers KC is an expert in mutual legal assistance who represents individuals as well as European and other governments in all manner of extradition cases. He has particular experience of handling US extradition matters.

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Crime - London (Bar)

Band 1

Individual Editorial

Mark Summers KC is highly respected by peers for his general crime work as well as his extradition expertise. He frequently takes on pre-arrest and advisory work, in addition to appearing at trial on behalf of both the prosecution and defence.

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Strengths

Provided by Chambers

Mark is very impressive. If he can't win, no one can.

Extradition respondent
UK Bar

Mark is very impressive on detail, tactics and law.

Extradition respondent
UK Bar

Mark Summer is outstanding. He sees everything 20 moves ahead and from 20 angles. A privilege to instruct him on any case.

Extradition respondent
UK Bar

He is a brilliant lawyer. He is steps ahead of everyone else, both on the law and on preparation. He is one of the best advocates at the Bar.

Crime respondent
UK Bar

Summers is brilliant and very good.

Crime respondent
UK Bar

Mark Summers KC is very impressive.

Crime respondent
UK Bar

He is one of the best oral advocates. He has a tremendous legal mind.

Crime respondent
UK Bar

Mark Summers KC is technical and good at what he does.

Crime respondent
UK Bar

Mark is very impressive. If he can't win, no one can.

Extradition respondent
UK Bar

Mark is very impressive on detail, tactics and law.

Extradition respondent
UK Bar

Mark Summer is outstanding. He sees everything 20 moves ahead and from 20 angles. A privilege to instruct him on any case.

Extradition respondent
UK Bar

He is a brilliant lawyer. He is steps ahead of everyone else, both on the law and on preparation. He is one of the best advocates at the Bar.

Crime respondent
UK Bar

Summers is brilliant and very good.

Crime respondent
UK Bar

Mark Summers KC is very impressive.

Crime respondent
UK Bar

He is one of the best oral advocates. He has a tremendous legal mind.

Crime respondent
UK Bar

Mark Summers KC is technical and good at what he does.

Crime respondent
UK Bar

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Silks (KC)

All Circuits

Defamation/Privacy

Antony White KC

Star Individuals

Mark Summers KC

UK Bar Guide 2026

Extradition + 1 more ranking

About

Practice Areas

Publications

Chambers Review

UK Bar

Extradition - London (Bar)

Individual Editorial

Crime - London (Bar)

Individual Editorial

Strengths

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Silks (KC)

All Circuits

Extradition

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