
Sebastian L. Fain is a partner at Gibson Dunn in New York, where he co-heads the firm's Cross Border M&A practice. With a focus on mergers and acquisitions, activism defense, and corporate governance, Sebastian has extensive experience in both domestic and cross-border transactions. His notable work includes advising on high-profile deals such as AstraZeneca's $39 billion acquisition of Alexion Pharmaceuticals and Universal Music Group's $40 billion spin-off from Vivendi SE. Recognized as a Dealmaker of the Year by The American Lawyer and one of the Top 250 Lawyers in America by Forbes, Sebastian is a leading figure in the legal industry, providing strategic counsel to boards and C-suites on critical corporate issues.
Partner
2025 – Unknown
Partner
2019 – 2025
Counsel
2018 – 2019
Associate
2008 – 2018
Summer Associate / Law Clerk
2006 – 2007
Senior Research Technician
2003 – 2005
Instructor
2004 – 2005