Brian MCDONNELL | Special Consultant, Financial Services Regulation
London, United Kingdom 
 

Brian is a distinguished financial services lawyer and partner at a hidden gem specialist boutique law firm, uniquely positioned to deliver expert regulatory advice in the City. With over 20 years of experience, including 12 years as a partner at prominent City law firms and most recently as Head of Financial Markets at Addleshaw Goddard, Brian has developed a reputation for providing practical and strategic solutions to financial services firms across the sector. He is recognized as a leading individual in Financial Services: Non-contentious Regulatory by both Chambers and Legal 500.

 

Financial regulatory advice is becoming increasingly specialised, with few lawyers in the City able to offer both the depth and breadth of expertise that Brian brings. His experience spans the full spectrum of financial services firms, including investment firms, asset managers, funds, banks, insurers, fintech companies, payment firms, and crypto businesses. From large international banks and asset managers to innovative fintech start-ups, Brian’s decades of experience enable him to address the nuanced challenges faced by each type of financial services provider.

 

Brian’s in-depth industry knowledge is grounded in hands-on regulatory experience, including time spent as regulatory counsel at the London Stock Exchange and a secondment to a large international bank, where he played a key role in implementing complex regulatory frameworks such as MiFID. This combination of advisory, regulatory, and in-house experience provides Brian with a unique ability to address both operational and compliance challenges with precision and insight.

 

Beyond his client work, Brian is an active thought leader in the financial services regulatory field. He is vice-chair of the City of London Law Society Regulatory Law Committee and a member of the Lexis Financial Services Consulting Editorial Board. He also serves as the UK legal advisor to the Association of International Life Offices and is the author of A Practitioner’s Guide to Inside Information (2nd edition), a leading resource published by Thomson Reuters.

 

As a special consultant to Thornhill Legal and a member of our Board of Advisors, Brian provides invaluable expertise in financial services regulation. His unmatched ability to combine depth and breadth of knowledge ensures that Thornhill Legal clients benefit from tailored advice that addresses their specific needs across diverse financial services sectors. This collaboration strengthens our capacity to support clients in navigating the increasingly complex regulatory landscape with confidence and success.

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