Denise Tsai is a litigator with an emphasis on securities and financial services litigation, complex commercial disputes, and internal corporate and government investigations. Ms. Tsai has represented corporations and their officers and directors in state and federal court and in administrative proceedings. Ms. Tsai also maintains an active pro bono practice, particularly in assisting immigrants through the US naturalization process and in providing legal services to low-income, self-represented litigants in the Massachusetts appellate court system. 

Prior to joining the firm, Ms. Tsai clerked for the Honorable Kiyo A. Matsumoto of the US District Court for the Eastern District of New York. During law school, she was a summer associate at WilmerHale, a student lawyer in the Immigrants' Rights Clinic at Stanford Law School, a judicial extern for Judge Matsumoto, and a research assistant for Stanford Law School Professor David F. Engstrom in the area of qui tam litigation.

Before attending law school, Ms. Tsai was an honors paralegal at the Antitrust Division of the US Department of Justice in Washington DC, where she worked on a variety of merger investigations. 

Ms. Tsai co-authored the Massachusetts Superior Court Civil Court Practice Manual Posttrial and Appellant Rights


  • Secured judgment on all counts for Harvard University in a case challenging the use of race in its undergraduate admissions process following three-week federal bench trial
  • Represented insurance carriers in claims alleging breaches of representations and warranties insurance  
  • Defended a major financial institution in a cross-border investigation relating to allegations of fraud, including before the SEC and DOJ
  • Represented various corporations in the consumer products and services sector in internal and government investigations and class action and derivative lawsuits relating to revenue recognition, stock drops, and corporate governance and controls 
  • Secured favorable outcomes in several high-stakes investigations involving congressional, federal and state authorities 


  • Selected for inclusion in the 2021-2023 editions of Best Lawyers: Ones to Watch for securities litigation and in 2022-2023 for white-collar criminal defense 

Insights & News


  • Education

    • JD, Stanford Law School, 2013

      Submissions Chair, Stanford Journal of International Law
    • BA, Political Science, Amherst College, 2007

      magna cum laude, with Distinction in English Phi Beta Kappa
  • Admissions

    • Massachusetts

  • Clerkships

    • The Hon. Kiyo A. Matsumoto, US District Court for the Eastern District of New York, 2013 - 2014