Diana K. Lloyd

Co-Chair - Government Enforcement & Compliance

Diana Lloyd, co-chair of Choate’s Government Enforcement & Compliance Group, has over 25 years of experience helping clients to successfully manage federal and state government enforcement matters, internal investigations, and related business and securities litigation. Throughout her career, she has earned a strong reputation for dissuading governmental agencies from pursuing enforcement or criminal action against her clients.

Diana has extensive experience representing companies and individuals subjected to government investigations and prosecutions or in need of representation in connection with internal investigations of corporate and non-profit entities, including independent secondary schools and institutions of higher education.

A former Assistant U.S. Attorney for the District of Massachusetts in the Major Crimes and Economic Crimes Units, Diana investigated and prosecuted cases involving complex securities, insurance, defense contracting, tax and bank fraud; money laundering and RICO violations; and public corruption and other federal crimes. She has received numerous awards for excellence from the U.S. Attorney and various federal law enforcement agencies.


  • Named a Fellow of the International Academy of Financial Crime Litigators
  • Chambers USA (2013-2024)
  • Best Lawyers in America: "Boston Lawyer of the Year" for Securities Litigation in 2018 and 2020
  • Best Lawyers in America (2015-2024)
  • Named a Massachusetts Super Lawyer since 2005, and named among the top 50 women and top 100 Massachusetts Super Lawyers
  • “Litigation Star” by Benchmark Litigation
  • Business Today “Top 10 Massachusetts Attorneys Influencing White-Collar Crime Litigation in 2023”

Representative Engagements

  • Defense of corporations, investment advisers and individuals in securities - related investigations, including whistleblower investigations, involving  variety of civil and potentially criminal allegations.
  • Representation of major pharmaceutical companies in federal investigations into sales and marketing practices.
  • Representation of private schools and institutions of higher education in internal and government investigations, including sexual misconduct, Title IX, and fraud investigations.
  • Successful representation of healthcare-related entities and individuals in federal healthcare fraud government investigations.
  • Provide FCPA advice to entities in connection with internal and government investigations.
  • Representation of medical device company in qui tam whistleblower investigation and related civil action.
  • Obtained reversal of federal criminal conviction for multi-year conspiracy involving alleged environmental fraud.
  • Successful representation of individuals and entities investigated in federal public corruption investigations.
  • Special Counsel to the Massachusetts Supreme Judicial Court, for the purpose of conducting an independent inquiry regarding the Massachusetts District Courts and the Boston Municipal Court.
  • Defense of former executive of major medical device manufacturer who was acquitted of conspiracy to defraud the U.S. after a lengthy trial.

Publications and Presentations

Professional and Community Involvement

  • Past President of the Boston Bar Foundation
  • Prior member of the Boston Bar Association Council and Executive Committee
  • Served on the Steering Committee of the Boston Bar Associate 2018 White Collar Conference
  • Served as co-chair of the Steering Committee for the Criminal Section of the Boston Bar Association from 2008-2010
  • Former member of the Board of Trustees of the Women’s Bar Foundation
  • Served for six years as a member of the Federal Criminal Justice Act panel, accepting court appointments to represent indigent defendants in federal criminal cases
  • Trustee of Gann Academy
  • Active in Combined Jewish Philanthropies
  • Member of Choate’s Diversity & Inclusion Committee, a former co-chair of the Firm’s Hiring Committee, and a former member of the Firm’s Executive Committee

Education & Credentials

New York University School of Law
JD, MA, 1989

Editor in Chief, New York University Law Review

St. Lawrence University
BA, 1984, Valedictorian, summa cum laude, Fulbright French Government Teaching Assistant



New York

U.S. District Court, Massachusetts

U.S. Courts of Appeals, First & Third Circuits


Honorable Amalya L. Kearse
U.S. Court of Appeals, Second Circuit

Diana's Insights