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Keith Mathieson

An expert in defamation and privacy law, Keith Mathieson has been defending the media for over 20 years and leads RPC's media team.

Keith defends clients involved in libel, privacy and similar claims.

Regularly instructed by Associated Newspapers Limited (Mail, Mail on Sunday and Mail Online), Mirror Group, News UK (The Sun, Times and Sunday Times) and the Financial Times, he also acts for numerous other UK and international publishers and for a number of media liability insurers.

Keith has had a prominent role in press regulation, including acting for Associated Newspapers throughout the Leveson Inquiry.  He is currently representing Mirror Group in the long-running litigation arising out of phone hacking at its three titles. He has particular experience of contentious costs matters in media cases.

Keith is the principal author and editor of The Privacy Law Handbook (Law Society Publishing, 2011) and has contributed to The Freedom of Information Handbook, 3rd edition (Law Society Publishing, 2012).  In 2013 he was named as one of The Lawyer's Hot 100.

Directory quotes

Keith Mathieson is recognised for his excellence in the defamation defence space. He routinely acts for clients such as newspapers, internet companies and media insurers. - Chambers UK 2019

"He has seen it all before and is incredibly calm. He has got very good judgement, and he instinctively knows which issues to pursue and which not to." - Chambers UK 2019

Keith Mathieson is an experienced litigator with specialist expertise in news media regulation, freedom of information and data protection. - Chambers UK 2019

"He's outstandingly good." - Chambers UK 2019

Keith Mathieson acts for an enviable client list, which includes major newspapers and other publishers. He is highly regarded for his experience and judgement. - Chambers UK 2018

"He can instinctively spot where a case is heading and knows what to avoid." - Chambers UK 2018

[He has a] practical approach to problem solving. - Chambers UK 2018

 A "very experienced and capable litigator" - Legal 500 UK 2018

Listed as a leading individual. - Legal 500 UK 2018

Praised for being a "highly respected Partner who has a complete command of the legal issues." - Legal 500 UK 2018

Keith has "many years of experience and provides pragmatic solutions" - Legal 500 UK 2018

Keith Mathieson is "a first-rate lawyer" and "an excellent tactician, who is cool and collected under pressure and gives thoughtful and pragmatic advice". - Legal 500 UK 2017

Keith Mathieson has a "fantastic reputation" - Legal 500 UK 2017

Keith Mathieson leads the firm's defamation team and is deeply experienced in defending newspaper groups and other publishing clients in media litigation. Sources say he has "remarkably sound judgement and common sense" and is a "superb tactician." - Chambers UK 2017 

"hugely experienced and universally respected" - Legal 500 UK 2016

'The "outstandingly good" Keith Mathieson is a renowned defamation defence practitioner with extensive experience of representing media companies in some of the most high-profile trials. "He absolutely fights the corner of his client," say sources" - Chambers UK 2016

Listed in the elite "Leading lawyers" list, The Legal 500 UK 2015's guide to outstanding lawyers nationwide

"One of the best defendant lawyers in the business" - Legal 500 UK 2015

"The "hugely impressive" Keith Mathieson continues to be a trailblazer in defamation work... "unflappable, calm, measured, vastly experienced practitioner with decades of work in this field as a specialist" - Chambers UK 2015

"Recommended" - Legal 500 UK 2015 

"Combines sharp intelligence with an acute tactical awareness" - Legal 500 UK 2014

"Very practical" - Legal 500 UK 2014

"Exceptional"... A "commercially sound, first-rate solicitor," he "never makes a bad judgement" and "is calm, thoughtful and effective." Sources observe that he is "brilliant with clients" and sum him up as "absolutely solid gold" - Chambers UK 2014

Relevant work

Weller v Associated Newspapers

Yeo v Times Newspapers

Gulati and others v Mirror Group

AAA v Associated Newspapers

Henry v News Group