Stephen Kosmin > Chambers of James Goudie KC and Daniel Stilitz KC > London, England > Lawyer Profile

Chambers of James Goudie KC and Daniel Stilitz KC

Living Wage

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Stephen is highly regarded in administrative and public law, public procurement, financial services, and information and data protection law. 

Stephen has considerable experience in complex and high-profile judicial reviews, particularly in commercial and financial services litigation (e.g. concerning self-invested personal pensions). He appears frequently in the Supreme Court, Court of Appeal and High Court. Recently, he has been instructed by the Prime Minister, various central government departments, local authorities, the Financial Ombudsman, HMRC, the FSCS, the SFO, and the Bank of England, as well as private clients. Stephen is a member of the Attorney General’s B Panel.

In his procurement practice, Stephen is instructed by both authorities and bidders.  His cases this year include successfully defending a challenge to the award of Operation Moonshot contracts, a challenge to the £1.8bn contract for signalling on the East Coast Main Line, a challenge to the abandonment of an NHS services contract, and a challenge to the modification of a waste services contract.

Stephen is also a recognised expert in the field of information and data protection law, acting a range of private and public sector clients on FOIA, GDPR, and DPA issues. Stephen has been instructed on several cases concerning mass data breaches, including Ticketmaster.


Called to the Bar in 2011. Admitted as an Attorney to the New York Bar, 2011 (currently non-practising).

Lawyer Rankings

London Bar > Local government (including rating law)

(Leading Juniors)Ranked: Tier 3

Stephen Kosmin11KBW

London Bar > Financial services regulation

(Leading Juniors)Ranked: Tier 3

Stephen Kosmin11KBW ‘Stephen is excellent. His advice is clear, easy to understand and ultimately correct. His written drafting is also of a very high standard.’

London Bar > Data protection

(Leading Juniors)Ranked: Tier 3

Stephen Kosmin – 11KBW

London Bar > Administrative law and human rights

(Leading Juniors)Ranked: Tier 4

Stephen Kosmin11KBW ‘Stephen is extremely bright. He is always well prepared and his is advice is robust.’

London Bar > Public procurement

(Leading Juniors)Ranked: Tier 3

Stephen Kosmin11KBW ‘Stephen is clearly an expert in his field. He is able to cut through detailed facts to highlight the key issues.’