Stephen A. Jonas


Stephen A. Jonas


  • Co-Chair, White Collar Defense and Investigations Practice

Stephen A. Jonas is co-chair of the firm's White Collar Defense and Investigations Practice. His practice focuses on representing corporations and individuals in investigations and criminal defense and grand jury matters. Mr. Jonas' work includes the full range of representation of clients in this area from internal corporate investigations to federal grand jury representation to criminal trials and appeals. He has represented clients in jurisdictions around the country, as well as in cross-border investigations. Mr. Jonas also handles related False Claims Act cases, government enforcement proceedings and civil litigation. He has substantial experience in the areas of federal healthcare fraud, immigration fraud, accounting fraud, securities fraud, economic espionage and environmental crimes. Mr. Jonas also has experience in the unique issues of representing corporate and outside legal counsel in government investigations. Finally, Mr. Jonas frequently represents clients in investigations and litigation involving State Attorneys General.

Mr. Jonas joined Hale and Dorr in 1984. In 1988, Mr. Jonas was appointed Deputy Attorney General and Chief of the Public Protection Bureau of the Massachusetts Attorney General's Office, which handled all of the Commonwealth's environmental, civil rights and consumer enforcement investigations and litigation, as well as its nuclear plant safety and asbestos property damage litigation. Mr. Jonas rejoined the firm in 1991.

Professional Activities

Mr. Jonas is a member of the American Bar Association, the Massachusetts Bar Association and the National Association of Criminal Defense Attorneys.


  • Representing international pharmaceutical and medical device companies in federal criminal healthcare fraud investigations conducted by the DOJ and related false claims act cases
  • Representing medical device and pharmaceutical company executives and employees in criminal healthcare fraud investigations conducted by the DOJ
  • Representing an Indian-based worldwide business technology company in federal grand jury and related investigations concerning immigration matters
  • Trial counsel for the former executive vice president and general counsel of a software company in a federal securities fraud trial
  • Trial counsel for in house corporate counsel prosecuted by the DOJ in federal criminal environmental case
  • Representing an investment advisory firm in connection with a federal investigation and trial of public corruption in New York State
  • Representing a Far East-based food processing company in a federal criminal investigation of alleged violations of endangered species laws and the federal Food, Drug and Cosmetic Act
  • Representing Hess Corporation in a false claims suit by the Massachusetts Attorney General’s Office alleging violations of state environmental cleanup fund’s regulations and submission of false claims for reimbursement from fund.


  • Recognized among the 2019–2022 Best Lawyers in America for his work in healthcare law and in 2022 for white-collar criminal defense
  • Recommended by The Legal 500 United States for his white-collar criminal defense practice in 2016–2018
  • Named a "New England Super Lawyer" (formerly "Massachusetts Super Lawyer") in white collar criminal defense in the 2004–2008 and 2011–2019 issues of Boston Magazine
  • Selected as one of the world's leading defense lawyers in the 2012–2016 editions of Who's Who Legal: The International Who's Who of Business Crime Defence Lawyers, with sources recently saying he is "a leading figure at the Massachusetts bar who is very well-known for representing corporations and individuals in government investigations and criminal matters." 
  • Selected by clients and peers as being among the world's leading investigations lawyers in the 20152017 editions of Global Investigations Review's Who's Who Legal: Investigations
  • Named a Life Sciences Star in the 2012–2020 editions of LMG Life Sciences for government enforcement/investigation  

Insights & News


  • Education

    • JD, Columbia Law School, 1982

    • BA, Dartmouth College, 1979

      summa cum laude Phi Beta Kappa
  • Admissions

    • Massachusetts

    • US Supreme Court

  • Government Experience

    • State and Local Government

      Deputy Attorney General, Massachusetts
    • State and Local Government

      Chief of Public Protection Bureau, Massachusetts’s Attorney General's Office