Position:
Partner lawyer
“Tom is an experienced and composed individual who is very focused on practical solutions and ensuring that deals stay on track.” Chambers UK 2025. Tom has earned recognition from numerous leading legal publications in the field of corporate/M&A and private equity transactions, including IFLR 1000, Legal 500 UK, Chambers UK, and Chambers Europe.
Partner lawyer
12 Years
In 2026, Chambers UK and Chambers Global named him an Outstanding Practitioner in Corporate/M&A: £100 million to £800 million. A source noted, "He is intelligent, quick-witted, and courteous. He is easy to work with and highly respected."
Chambers Europe 2025 – Ranked as an Outstanding Practitioner in Corporate/M&A: Mid-market. Chambers UK 2025 Rankings – Ranked as an Outstanding Lawyer in Corporate/M&A. A source noted, "Tom is an experienced, composed lawyer who focuses heavily on practical solutions and ensuring deals stay on track." Chambers Europe 2024 Guide – Ranked in Corporate/M&A: High-end Capabilities. A source noted, "Thomas is an excellent team leader," and "Thomas always brings meaningful insights and high value to the cases we handle." Chambers UK 2024 – Corporate/M&A Ranking: £100 million to £800 million – London (Company), a source commented: “Thomas Thesing is experienced, intelligent, and provides strong business support.” 2023 Chambers UK Guide – Client review: “Thomas has been extremely helpful on both strategic and purely legal matters. He is experienced, knowledgeable, and provides excellent support.” 2021 Chambers UK Guide – Client review: “His expertise in the relevant areas and comprehensive understanding of the transaction are outstanding.” 2021 Legal Business Awards – Awarded “Private Equity Team of the Year”.Tom Thesing is the Managing Partner of Sidley Austin's London office and a member of Sidley's Management and Executive Committees. His primary practice areas include cross-border mergers and acquisitions, corporate finance, and strategy/corporate governance. Tom represents both buyers and sellers of publicly traded and private companies and advises boards of directors on matters related to acquisitions, corporate and financial restructuring, and corporate governance.
He also has experience in private equity/venture capital and joint ventures. Tom has extensive experience in transactions in regulated industries such as financial and payment services, healthcare and life sciences, and technology and internet-related businesses. Tom is particularly known for his cross-border experience; almost all the transactions he has led involve parties and companies in multiple jurisdictions and often span multiple continents, including the Americas, Europe, Asia, or Africa.
73 Bridge St Brooklyn, USA.
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