B. Stephanie Siegmann

White-Collar Defense and Civil Litigation Experience:

• Successfully represented a public company headquartered in the United States in an export control investigation conducted by the U.S. Department of Commerce, Office of Export Controls. The investigation was closed with the government taking no action against the company.
• Successfully represented an individual charged in a high-profile national security matter with making false statements to the FBI and engaging in a scheme to conceal material information, and secured a sentence of no jail time. Convinced the federal judge to allow the defendant to complete his collegiate education while on supervisory release in a foreign country.
• Represented a global life sciences company in conducting an internal investigation of the theft of trade secrets and succeeded in negotiating a favorable settlement from a former employee prior to filing a lawsuit.
• Represented a cooperating healthcare company in state attorney general investigation for Medicaid and Medicare fraud, False Claims Act violations, and money laundering offenses resulting in charges against one of its vendors.
• Represented an individual in a DOJ prosecution for insider trading and secured a sentence of no jail time.
• Defended a medical professional investigated for violations of Controlled Substances Act and secured favorable resolution of matter with U.S. Attorney’s Office for the District of Massachusetts.
• Represented a laboratory technician being investigated for research misconduct and falsifying data related to two NIH research grants. Secured a favorable voluntary settlement with NIH in which respondent was not required to make any admissions nor was he barred from conducting research in the future.
• Led the internal investigation of a former employee of a global technology company for embezzlement, wire fraud, and drug offenses uncovered as a result of ransomware attack resulting in successful DOJ prosecution and recovery of losses.
• Represented an attorney victim of real estate wire fraud scheme in successfully mediating and resolving matter.
• Currently representing a healthcare company in an investigation of Medicaid fraud and State False Claims Act violations.
• Currently representing an individual in multi-pronged investigations regarding alleged antitrust and False Claims Act violations.
• Defend individuals being investigated for research misconduct by research institutions and federal agencies, including the National Institutes of Health (NIH).

Cyber, AI, and International Trade Regulatory Compliance:

• Led cyber incident response and data breach investigations for numerous companies of all sizes and types, from manufacturers, technology companies, and financial institutions to accounting and legal services businesses in connection with network intrusions, ransomware attacks, email and text message compromise scams resulting in wire fraud, and theft of sensitive data.
• Performed export control classification and licensing requirement analyses for all types of organizations ranging from start-ups to large, public companies involving numerous items including hardware, software platforms, and technology that incorporate encryption as well as AI-related systems.
• Assist companies of all sizes from a global energy services company to healthcare provider in the deployment of AI tools and implementation of AI governance policies, including AI-acceptable use policies, and conduct risk assessments of AI tools and systems.
• Provide strategic advice and legal assistance on U.S. import laws and regulations as well as tariffs to companies seeking to import goods from overseas.
• Assist companies and educational institutions regarding compliance issues stemming from expansion of immigration enforcement actions under the new Trump administration as well as national security issues.
• Conducted sanctions review and due diligence analysis for a financial institution to ensure compliance with U.S. laws and regulations.
• Conducted internal investigation of U.S. based manufacturer’s compliance with, among other things, cybersecurity requirements imposed under the FAR and DFARS and export control laws.
• Advise and assist organizations on cybersecurity, government contractual requirements, safeguarding electronic protected health information, HIPAA issues, data privacy, export control laws and sanctions, the Foreign Agents Registration Act (FARA) and national security laws such as the regulations pertaining to the Committee on Foreign Investment in the United States (CFIUS), online threats, protection of intellectual property and proprietary information, insider threats, fraud, and general compliance matters.

As the District of MA National Security Chief from 2018-2022:

• Supervised all national security investigations and prosecutions in the District of Massachusetts including several cyberattacks by suspected foreign actors and the theft of trade secrets from several U.S. based companies;
• Supervised trial of Harvard Professor Charles Lieber for federal grant fraud by lying about his involvement in China’s Thousand Talent Plan resulting in his conviction on all counts in the December 2021;
• Supervised successful prosecution of a researcher at Harvard-affiliated Beth Israel Deaconess Medical Center for lying about attempting to smuggle 21 vials of biological materials (hidden in his luggage) to China;
• Supervised the prosecution of a Raytheon employee, Ahmedelhadi Yassin Serageldin, for the mishandling of classified information;
• Supervised the investigation of two hackers charged in September 2020 with damaging multiple websites across the United States as retaliation for the United States military action in January 2020 that killed Qasem Soleimani, the head of the Islamic Revolutionary Guard Corps-Quds Force; and
• With DOJ’s National Security Division, conducted an extensive investigation of SAP SE, a software company headquartered in Germany, involving the analyses of thousands of documents and witness interviews overseas after a voluntary self-disclosure was made to DOJ resulting in the approval of non-prosecution agreement due to the extensive cooperation and remediation efforts costing more than $27 million.

Representative trials and guilty pleas while a national security prosecutor include:

• United States v. Shuren Qin(2018-2021) – After successfully overcoming several motions including, a motion to suppress evidence obtained from border search of electronic devices, negotiated a guilty plea to ten charges, including illegal exports of items used in anti-submarine warfare to a Chinese military university on the U.S. Department of Commerce’s Entity List.
• United States v. David Wright and Nicholas Rovinski (2015-2020) – Successfully prosecuted two individuals for conspiring to provide material support to the Islamic State of Iraq and Syria (ISIS) and plotting to behead persons in the United States. This terrorist cell was in direct contact with an ISIS leader/recruiter in Syria. Obtained guilty plea of Rovinski who agreed to cooperate and testify at Wright’s trial. Lead counsel at Wright’s trial, involving numerous novel and complex issues, which resulted in convictions against Wright on all counts.
• United States v. Sihai Cheng (2013-2017) – Oversaw and coordinated an extensive investigation of Cheng, a Chinese citizen, who was responsible for creating an illegal procurement network that supplied hundreds of U.S. manufactured pressure transducers (a critical component in developing weapons’ grade uranium) to Iran’s nuclear weapons program using front companies located in China and conspirators located in several countries. Upon learning that Cheng had traveled from the PRC to the United Kingdom, succeeded in obtaining Cheng’s extradition from the United Kingdom to face charges in the United States. Cheng pled guilty to six counts of conspiring to export and illegally exporting pressure transducers to Iran through PRC over a period of several years. At sentencing hearing, presented expert testimony on Iran’s nuclear program and how Cheng’s activities gravely harmed the national security of the United States. As a result, Cheng received a sentence of nine years’ imprisonment, which was affirmed by the First Circuit.
• United States v. Dias Kadyrbayev, Azamat Tazhayakov, Robel Phillipos (2013-2015) – Successfully prosecuted the cases commonly referred to as the Boston Marathon Bombing obstruction cases. After the FBI released pictures of the suspected Boston Marathon bombers (Tamerlan and Dzhohzar Tsarnaev) to the public seeking assistance in identifying them, Dzhokhar Tsarnaev’s college friends (Kadyrbayev, Tazhayakov, and Phillipos) went to Dzhokhar’s dorm room and removed critical evidence and lied to law enforcement.
• United States v. David Maricola (2012-2015) – Successfully prosecuted a Massachusetts resident for illegally exporting hundreds of assault rifle and firearm components to people in more than 20 countries. Maricola pled guilty to a 34-count indictment charging him with violations of the Arms Export Control Act, smuggling, and money laundering.
• United States v. Rezwan Ferdaus (2011-2012) – Oversaw undercover investigation of, and successfully prosecuted, a 26-year old al Qaeda radicalized individual who planned to attack the Pentagon and U.S. Capital Building using remote controlled aircraft filled with C4 plastic explosives. Ferdaus pled guilty and is serving a 17-year sentence of imprisonment.
• United States v. Hok Shek Chan (2009-2011) – Succeeded in extraditing Chan from Hong Kong (this was the first time Hong Kong had extradited anyone to the U.S. for export violations since it reverted back to the sovereignty of the PRC in 1997) and after extensive pre-trial litigation, Chan pled guilty to conspiring to illegally exporting, and attempting to export, U.S. military aircraft parts to the Islamic Republic of Iran through Hong Kong.
• United States v. Zhen Zhou Wu, Yufeng Wei, Chitron Electronics, Inc. (2006-2010) – Lead counsel in the successful prosecution of a ten-year conspiracy to violate U.S. export laws. On May 10, 2010, following a six-week trial, involving more than 800 exhibits and 40 witnesses including five expert witnesses, a federal jury found Wu, Wei, and Wu’s company, Chitron Electronics, Inc., guilty of conspiring, from 1997 to 2007, to illegally export defense articles and sophisticated electronics/semi-conductors used in military phased array radar, electronic warfare, and missile systems from the United States to the PRC and illegally exporting such parts to the PRC on numerous occasions between 2004 and 2007. Wu’s customers included Chinese military research institutes and military entities responsible for procuring, developing, and manufacturing electronic components for China’s Army (PLA), Navy, and Air Force.

Work Experience

• Hinckley Allen
  • Partner (2022-Present)
  • Co-Chair, Artificial Intelligence
  • Chair, International Trade & National Security Group
  • Chair, Cybersecurity, Privacy & Data Protection Group
• United States Attorney’s Office, National Security Unit
  • Chief (2018-2022)
  • Assistant U.S. Attorney (2003-2018)
• Boston College Law School
  • Part-time Faculty Member, MLS in Cybersecurity, Risk, and Governance Program (June 2023 – Present)
• Suffolk University Law School
  • Adjunct Faculty Member (2011-2013)
• Edwards & Angell, LLP
  • Litigation Associate – Intellectual Property and Business Disputes (2003)
• Hill & Barlow
  • Litigation Associate (2001-2003)
• United States Navy, Judge Advocate General’s Corps
  • Trial Counsel (1997-2001)

Honors & Awards

• Best Lawyers in America® (2025-2026)
  • Criminal Defense: White-Collar
• Chambers and Partners, Chambers USA (2025-2026)
  • Litigation: White-Collar Crime & Government Investigations
• Legal 500, US Elite: Boston (2026)
  • White Collar Crime
• Boston Magazine, Top Lawyers (2022-2025)
  • Criminal Defense: White Collar
• Super Lawyers, Massachusetts (2023-2025)
  • Criminal Defense: White Collar
• UMass Boston, Distinguished Alumni Beacon Award (2025)
• Massachusetts Lawyers Weekly
  • Go To Lawyer for Cybersecurity and Data Privacy (2022, 2024)
  • Top Woman of the Law Award (2021)
• Executive Office of U.S. Attorneys, Director’s Award for Superior Performance as an Assistant U.S. Attorney (2017)
• Department of Homeland Security, Homeland Security Investigations Director's Award, Outstanding Counterproliferation Investigation for the successful prosecution of Qiang Hu and Sihai Cheng (2016)
• Women in Federal Law Enforcement, Top Prosecutor, National Security (2011)
• Department of Homeland Security, Homeland Security Investigations Director's Award, Outstanding Counterproliferation Investigation for the successful prosecution of Zhen Zhou Wu, Yufeng Wei, and Chitron Electronics (2011)
• Navy and Marine Corps Commendation Medal (2000)
• Navy and Marine Corps Achievement Medal (1999)

Professional Affiliations

• Boston Bar Association
  • Higher Education Conference Advisory Committee (2026)
  • White Collar Crime Section Steering Committee (2021-2022, 2023-2025)
  • International Law Section Steering Committee (2022-2023)
  • Government Lawyer’s Forum Advisory Committee (2020-2022)
• The International Association of Privacy Professionals, Inc. (IAPP)
• Law360, Massachusetts Editorial Review Board (2023-2024)
• National Defense Industrial Association, New England Chapter
  • Vice President (2022-2024)
  • Board Member (2022, 2025-Present)
  • Government Liaison (2021-2022)
• SecureWorld Boston, Advisory Council (2026)
• The Women's Bar Association of Massachusetts, Women in the Courtroom Committee, Co-Chair (2021-Present)
• Women's White Collar Defense Association, Global Programs Committee, Vice Chair (2025-Present)

Bar Memberships

• District of Columbia
• Massachusetts
• United States Court of Appeals for the Federal Circuit
• United States Court of Appeals for the First Circuit
• United States District Court for the District of Massachusetts
• United States Court of Federal Claims

Publications

• "The Prosecution of Chitron Electronics, Inc.: How We Identified, Prosecuted, and Dismantled a Chinese Front Company Hiding in the United States," U.S. Attorney's Bulletin, November 2013
• Stephanie Siegmann & Daniel C. Winston, “Copyright Infringement,” Chapter 6 of MCLE’s Business Torts in Massachusetts (2002)
• “Jack Teixeira Pleads Guilty to Leak of Pentagon Secrets.” TIME, 4 Mar. 2024.

  • B. Stephanie Siegmann quoted in TIME’s article.