Leveraging her extensive and vast investigative and trial experience as a former Navy JAG and national security prosecutor, B. Stephanie Siegmann specializes in handling cyber incidents, high-stakes civil and criminal investigations, prosecutions, and enforcement proceedings as well as sensitive internal investigations. Stephanie is a litigation partner at Hinckley, Allen, & Snyder LLP, Chair of its International Trade & Global Security Group, and Co-Chair of its Cybersecurity, Privacy & Data Protection, and Artificial Intelligence Practice Groups.
Stephanie has been a trial lawyer for more than 25 years overseeing hundreds of complex investigations and trying dozens of trials. Stephanie understands the current threat landscape facing businesses and is uniquely positioned to assist organizations in preparing for, investigating, and mitigating risks of all kind, including those arising under the False Claims Act, Foreign Corrupt Practices Act, the Securities Exchange Act, and data privacy and national security laws. She offers extensive experience and insider perspectives on the application of national security and federal criminal laws, white-collar defense, trial tactics and strategies, cyber threats, crisis management, insider threats, and government enforcement.
Stephanie uses her experience as a former prosecutor to defend companies and individuals in complex government investigations and advises clients on a full range of issues involving national security, cybersecurity, cyber incident response, export controls and sanctions compliance, theft of trade secrets and intellectual property, governmental contractual requirements, the use of artificial intelligence tools, anti-money laundering, grant compliance, healthcare, and financial crimes. She conducts internal investigations, provides guidance on developing robust regulatory compliance programs, interfaces with law enforcement agencies, responds to government inquiries and subpoenas, seeks to favorably resolve government enforcement matters, and provides aggressive representation in civil and criminal matters.
Prior to joining Hinckley Allen in March 2022, Stephanie handled and supervised some of the highest profile national security matters in the country during her 18-year tenure as a former prosecutor and National Security Chief in the United States Attorney’s Office for the District of Massachusetts (USAO/MA). In her capacity, as the first female National Security Chief for USAO/MA, she was responsible for supervising all national security investigations and prosecutions in Massachusetts, including national security cyber intrusions, international and domestic terrorism, terrorist financing, violations of U.S. export control laws and sanctions regulations, theft of intellectual property and proprietary information, online threats, money laundering, espionage, and fraud. Stephanie began her career as a prosecutor in the Navy Judge Advocate General’s Corps where she prosecuted numerous violent crimes (i.e., murder, rape, and child abuse) as well as cases involving fraud and computer offenses.
Stephanie has earned numerous honors and awards during her career, most notably: Chambers USA (2025): White-Collar Crime & Government Investigations; Massachusetts Super Lawyers (2023-2025); Top Lawyer Criminal Defense by Boston Magazine (2022-2024); The Massachusetts Lawyer’s Weekly’s Top Woman of the Law (2021) and Cybersecurity and Data Privacy Go To Lawyer (2022, 2024): and the Women in Federal Law Enforcement Top Prosecutor in National Security (2011). While in the Navy, she earned both the Navy and Marine Corps Commendation Medal and Navy and Marine Corps Achievement Medal.
Additionally, since 2023, Stephanie has been a part-time faculty member at Boston College Law School and teaches national security law as part of the Cybersecurity, Risk, and Governance Program.
Stephanie graduated magna cum laude from the University of Massachusetts with a Bachelors of Arts Degree in History and Psychology and graduated magna cum laude from Suffolk University Law School with a Juris Doctor.