Diana K. Lloyd

Practice Group Leader - Government Enforcement & Compliance

Diana Lloyd is co-chair of Choate's Government Enforcement & Compliance Practice Group. She has over 25 years of experience in federal and state government enforcement matters, internal investigations and related business and securities litigation. An experienced trial and appellate attorney, Ms. Lloyd has also had considerable success dissuading governmental agencies from pursuing any enforcement or criminal action against her clients. As an Assistant U.S. Attorney in Boston, she received numerous awards for excellence from the U.S. Attorney and various federal law enforcement agencies.

Ms. Lloyd has been ranked among the top 50 women and top 100 Massachusetts Super Lawyers, has been recognized as a Massachusetts Super Lawyer since 2005, has been named a “Litigation Star” by Benchmark Litigation and is listed in Chambers USA and Best Lawyers in America. In 2018, Best Lawyers named her “Boston Lawyer of the Year” in securities litigation. She has been selected for inclusion in The International Who’s Who of Business Crime Lawyers each year since 2010.

Practice Focus

Government Enforcement & Compliance:  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.

Complex Financial Litigation & Securities Litigation:  handle private and SEC securities litigation, represent individuals and corporate clients before the SEC and FINRA.

Foreign Influence Compliance: manage NIH, HHS, and/or DOJ investigations, enforcement inquiries, and Congressional oversight requests into systematic programs of foreign influence at U.S. academic and research institutions.

Previous Experience

Prosecutorial:  Assistant U.S. Attorney, Boston in Major Crimes and Economic Crimes Units; Special Assistant District Attorney, Suffolk County District Attorney's Office.

Private Practice:  Sullivan & Cromwell, New York; Skadden, Arps, Slate, Meagher & Flom, Boston. 

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 educational institutions in internal investigations and government investigations.

  • Representation of health care-related entities in government investigations.

  • Representation/investigations involving private independent schools and institutions of higher education.

  • 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.

  • Representation of senior executives accused of sophisticated financial fraud.

  • Successful representation of numerous individuals in federal healthcare fraud investigations.

Publications and Presentations

Professional and Community Involvement

Ms. Lloyd currently serves as President of the Boston Bar Foundation. She is a 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, and served as co-chair of the Steering Committee for the Criminal Section of the Boston Bar Association from 2008-2010. She has also served on the Board of Trustees of the Women’s Bar Foundation. For six years, Ms. Lloyd was a member of the Federal Criminal Justice Act panel, accepting court appointments to represent indigent defendants in federal criminal cases. She is a Trustee of Gann Academy, is active in Combined Jewish Philanthropies, and previously served on various committees for the South Area Solomon Schechter Day School. She has taught in the Citizen Schools Trial Advocacy Program, an after-school enrichment program for Boston public school students. Ms. Lloyd is a current 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