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David Siesage


David has experience advising clients on a wide range of contentious matters, including banking, commercial and pensions litigation in the High Court, judicial review claims, commercial arbitrations under ICC Rules, and criminal and regulatory investigations by the Financial Conduct Authority and the Serious Fraud Office. 
His practice focuses on banking litigation, public law, political law, and pensions litigation. He also maintains an active pro bono practice, representing vulnerable people in appeals to public bodies. David is qualified in England & Wales, and has practised in London, Paris and Amsterdam.


Pro bono

Advising Bail For Immigration Detainees in its intervention in R (SM) v Lord Chancellor, a successful judicial review in relation to immigration detainees' access to legal advice. 

Advising disability benefits claimants in Employment Support Allowance and Personal Independence Payment appeal proceedings in the First-tier Tribunal. 

Assisting Fair Trials International with the preparation of a multi-jurisdictional report on use of evidence obtained via torture. 

Conducting research and interviews on technology in courts to contribute to JUSTICE's Understanding Courts report. 

Advising individuals at the Battersea Legal Advice Centre on private disputes, housing issues, and access to justice.

A&O Shearman was formed on May 1, 2024 by the combination of Shearman & Sterling LLP and Allen & Overy LLP and their respective affiliates (the legacy firms). Any matters referred to above may include matters undertaken by one or more of the legacy firms rather than A&O Shearman.