


Mark is a Partner at our London office specialising in investigations and white collar crime.
Mark has a 25-year track record of successful representations of individuals and corporates in many major Serious Fraud Office investigations, including IKEA, BAE Systems, Rolls Royce, LIBOR/EURIBOR, Forex, Independent Insurance, G4S Serco, Sweett Group, Barclays Qatar and Tysers Integro. He has also advised clients in relation to major prosecutions brought by the Financial Conduct Authority, HM Revenue and Customs, and the Financial Reporting Council.
Mark has very significant experience in conducting corporate internal investigations for clients that operate across a range of industries including financial services, education, energy and infrastructure and sports and retail. He advises corporates on governance, compliance, management systems and controls, as well as on implementing policies. Mark also advises in relation to risk and governance during key corporate events including M&A and distressed situations.
Much of his work involves clients facing scrutiny internationally and in complex “parallel proceedings” involving civil and regulatory litigation.
Mark has been ranked in the leading legal directories for white collar crime for almost 20 years. He is a recognised expert for both individuals and corporates, and is top ranked in the Chambers UK 2027 Guide for Financial Crime: Individuals (Band 1) and Corporate Crime & Investigations (Band 4). Mark is described as “one of the finest white-collar defenders in the business”, with a commentator noting that his “brilliance lies in his ability to manage significant clients with multi-faceted, multi-jurisdictional investigations, bringing together the right expertise and working under tight timescales”. Mark is also praised for his “impeccable judgement” and “brings skill and tenacity to every task.”
In The Legal 500 UK 2027 Guide, Mark is ranked as a ‘Leading Partner’ for both Regulatory Investigations and Corporate Crime, where he is described as a “confident leader.” One referee notes that “Mark has a pedigree of advising in complex multi-jurisdictional fraud cases” and “he brings exceptional strategic ideas to every case.” The Guide also praises Mark for being “calm and authoritative.”
Mark is Chair of the American Bar Association (ABA) International White Collar Crime Committee, the first non-American citizen to hold such a post, and he is an honorary member of AIJA, The International association of Young Lawyers having served on their Executive for many years.
He is also the author and Editor of numerous books and articles including the successful ABA Publication “An International Guide to Corporate Internal Investigations”.
Investigations and White-Collar Crime
Individual Representations
Article: Crypto that could be criminal – New Law Journal – 22 October 2026
Article: Record of £4.7 million Russian sanctions penalty signals new OFSI enforcement landscape – Thomson Reuters Regulatory Intelligence – 15 October 2026
Article: OFSI’s largest Russian sanctions penalty: Takeaways and practical tips – Global Relay Intelligence & Practice – 6 October 2026
Article: Privilege & disclosure: a new landscape? – New Law Journal – 18 September 2026
Article: UK’s new cryptoasset regulations: FCA significantly expands remit, enforcement powers – Thomson Reuters Regulatory Intelligence – 15 September 2026
Article: Crypto meets criminal law: The UK’s new regulatory regime – Global Relay Intelligence & Practice – 11 September 2026
Article: What does the FRC’s overhauled investigation process mean for firms? – Business & Accountancy Daily – 10 August 2026
Article: FRC Audit Enforcement reforms: New pressure points for audited entities – Insolvency Insider – 23 July 2026
Article: SFO Plan Focuses On Resilience But Funding Doubts Persist – Law360 – 6 May 2026
Article: What UK’s New Prosecution Guidance Means For Compliance – Law360 – 18 September 2025
Article: Failure to prevent fraud: key takeaways for directors – Business & Accountancy Daily – 15 September 2025
Book: An International Guide to Corporate Internal Investigations, Second Edition – American Bar Association – 12 September 2025
Press Quote: What the ‘failure to prevent fraud’ offence means for advisers – FT Adviser – 11 September 2025
Article: ANALYSIS: SFO-CPS issue corporate prosecution guidance – Thomson Reuters Regulatory Intelligence – 2 September 2025
Press Quote: Signature Launches White Collar Crime and Investigations Practice with New Partner Team Hire – Corporate Counsel Business Journal – 14 July 2025
Press Quote: Mark Beardsworth and Duncan Grieve join Signature Litigation – Litigation Finance Insider – 14 July 2025
Press Quote: Revolving Doors: Linklaters adds eight-lawyer Paris team as Goodwin hires in London and Broadfield recruits from Sidley and Kirkland – Legal Business – 11 July 2025
Press Quote: The Revolving Door: Goodwin Nabs Debt Pro From Kirkland – Law360 – 11 July 2025
Press Quote: Dynamic Duo Putting a Signature on White Collar Crime – Edward Fennell’s Legal Diary – 11 July 2025
Press Quote: Signature makes twin London partner hire to launch white-collar crime practice – The Global Legal Post – 11 July 2025
Interview: Signature Hires 2 Pros For New White-Collar Crime Practice – Law360 – 10 July 2025
Press Quote: Signature launches new practice with white-collar duo – CDR News – 10 July 2025
Press Quote: Goodwin and Cadwalader Partners Leave to Launch Signature’s White Collar Practice – Law.com International – 10 July 2025