Diana K. Lloyd

Practice Group Leader - Government Enforcement & Compliance

Diana Lloyd is co-chair of the firm’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 US Attorney in Boston, she received numerous awards for excellence from the US 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 and is listed in Chambers USA and Best Lawyers in America.  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 corporate investigations.  

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

Previous Experience

Prosecutorial:  Assistant US 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 healthcare-related entities in government investigations.
  • Provide FCPA advice to entities in connection with internal and government investigations.
  • Representation of medical device company in qui tam whistleblower investigation.
  • Obtained reversal of federal criminal conviction for multi-year conspiracy involved 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 US 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 serves as President-Elect of the Boston Bar Foundation and is also a member of its Executive Committee.  She is a prior member of the Boston Bar Association Council and Executive Committee.  Ms. Lloyd served as co-chair of the Steering Committee for the Criminal Section of the Boston Bar Association from 2008-2010 and 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 co-chair of Choate's Hiring Committee, a current member of its Diversity & Inclusion Committee and a former member of the firm's Executive and Associates Committees.

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

US District Court, Massachusetts

US Court of Appeals, First & Third Circuits


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