Sienna Liu
Sienna Liu joined Friedman Kaplan in November 2026 to focus on complex commercial litigation.
Prior to joining Friedman Kaplan, Sienna was an associate in the New York and London offices of Sullivan & Cromwell LLP. During her time there, she represented clients in litigation involving securities class actions, bankruptcy-related disputes, commercial disputes, and product liability class actions and related shareholder and regulatory issues. She also advised on antitrust matters, including with respect to complex cross-border transactions.
Sienna maintains an active pro bono practice. She spent six months on secondment to the Federal Defenders of New York, where she represented indigent clients in federal criminal proceedings. She was also a member of the Sullivan & Cromwell team that received the Sanctuary for Families' 2026 Above & Beyond Award.
Fast Facts
Practice Areas
Education
Harvard Law School, J.D., cum laude (2020)
Duke University, B.A., magna cum laude, Phi Beta Kappa (2017)
Bar Admissions
State of New York
U.S. District Courts for the Southern and Eastern Districts of New York
Law Review and Publications
Line Editor, Harvard International Law Journal
