B. Stephanie Siegmann

Leveraging her extensive and vast experience as a former Navy JAG and national security prosecutor, Stephanie specializes in handling high-stakes criminal and civil litigation matters, sensitive internal investigations, government enforcement proceedings and cyber-related incidents of all kinds. She is a litigation partner at Hinckley, Allen, & Snyder LLP and serves as the Chair of its Cybersecurity, Privacy, International Trade, and National Security Practice Groups and Co-Chair of its Artificial Intelligence Practice Group. Stephanie has been a trial lawyer for more than 25 years, has overseen hundreds of complex investigations, and tried dozens of federal trials. She 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, export controls, sanctions, cybersecurity, cyber incident response, data privacy, the use of AI tools and systems, anti-money laundering, grant compliance, theft of trade secrets and intellectual property, and healthcare and financial crimes. Stephanie understands the current threat landscape facing businesses and is uniquely positioned to assist organizations in preparing for, investigating, and mitigating risks of all kinds, including those arising under the False Claims Act, the Securities Exchange Act, and data privacy and national security laws. Stephanie 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. In her capacity as National Security Chief, she was responsible for supervising all national security investigations/prosecutions in Massachusetts, including cyber intrusions, international and domestic terrorism, terrorist financing, violations of U.S. export control laws and sanctions regulations, espionage, trade secret theft, foreign influence operations, money laundering, and grant fraud.

Stephanie has earned numerous honors and awards during her career, most notably, she is ranked as a top lawyer in White-Collar Crime & Government Investigation by Chambers and Partners (2025) and Legal500 (2026). She was also the recipient of the 2025 UMass Boston Distinguished Alumni award. Stephanie graduated magna cum laude from the University of Massachusetts with a Bachelor of Arts Degree in History and Psychology and graduated magna cum laude from Suffolk University Law School with a Juris Doctor. She also teaches as an adjunct faculty member at Boston College Law School’s Master of Legal Studies in Cybersecurity, Risk and Governance.