Elite Talent From Domestic and International Agencies to Further Reinforce 5Si’s Position as a Global Leader in Intelligence and Security Services

5 Stones intelligence (5Si)®, a leading professional intelligence and investigations firm headquartered in Miami, FL, with additional offices in Washington, D.C. and across the globe, has announced a significant expansion of its leadership team. The company has welcomed seven seasoned law enforcement, intelligence, and military professionals from the U.S., U.K., and Israel, while also promoting two exemplary internal leaders, further strengthening its position as the operator of the world's largest private HUMINT intelligence network serving government, corporate, and private-sector Clients worldwide.

The new hires include Helene Miller KPM, former London Metropolitan Police Detective Chief Inspector; Bailea Tinsley, former FBI Special Agent; Daniel Forst, former Israel Defense Force Unit 8200; Mack Strong, former HSI Miami Supervisory Special Agent; Matthew Germanowski, former DEA Special Operations Senior Executive; John Gazzarra, former DEA Assistant Special Agent in Charge; and Louis Sastre, former Miami Police Task Force Agent. In addition to these appointments, Grayson Blake has been promoted to Director of Science & Technology Services, and Matthew Tinsley has been promoted to Chief of Staff.

"Our Clients rely on us for their most sensitive investigations and intelligence challenges," said Brian Talay, CEO of 5Si. "With more than 100 years of combined global law enforcement and intelligence experience, the addition of these exceptional individuals further enhances our global services and enables us to continue delivering extraordinary outcomes for our Clients."

• Helene Miller, KPM, 5Si's Director of Global Investigations and Risk Management for the United Kingdom and Europe, provides strategic investigative leadership to 5Si's government and commercial Clients across Europe from the firm's London office. A decorated former Detective Chief Inspector with London's Metropolitan Police Service, Miller brings more than 30 years of leadership in complex investigations, risk management, and international crime operations. She also served with the U.K.'s National Crime Agency (NCA). She was awarded the prestigious King's Police Medal for distinguished service. Recognized as "Crime Fighter of the Year" for her work combating modern slavery and human trafficking, Miller led a 120-person detective unit specializing in mass fatalities, family liaison, and high-risk cases.
• Bailea Tinsley, 5Si's Director of Global Investigations and Intelligence Services, operates from the Washington, D.C. office. A former FBI Special Agent, Tinsley brings extensive experience investigating transnational criminal enterprises and complex financial crimes, including major cases on Native American reservations. Her assignments spanned the Baltimore, Nashville, and Oklahoma City field offices. Before joining the FBI, she practiced law in Finance and Corporate Restructuring and holds a J.D. from Emory University School of Law. Tinsley is also trained in multiple law enforcement and intelligence disciplines and is proficient in French with additional Arabic skills. At 5Si, she leads high-level global investigations and litigation strategies for government and commercial Clients across diverse international sectors.
• Daniel Forst, 5Si's Director of Global Technology Solutions and Services, is based in the firm's Jerusalem office. A veteran of Israel's elite IDF Unit 8200, Forst brings over 20 years of experience advancing deep-tech solutions across defense, homeland security, and intelligence sectors. He has led high-impact initiatives on Iran and global terrorism, operating in politically unstable regions and conflict zones. A recognized subject matter expert in Technical Covert Operations, Forst provides 5Si Clients with access to cutting-edge technologies and strategic guidance on complex geopolitical threats. He holds a degree in East Asian Studies from the Hebrew University of Jerusalem and speaks multiple languages. Forst also supports veteran-focused resilience programs and serves on the board of a nonprofit educational theater.
• Mack Strong, 5Si's Director of Global Security and Sensitive Investigations and Intelligence, oversees complex international investigations from the firm's Miami office. A distinguished former HSI Supervisory Special Agent, Strong led groundbreaking international operations for the Department of Homeland Security focused on complex financial crimes, illicit networks, and national security threats. He is a recognized subject matter expert in anti-money laundering, kleptocracy, OFAC sanctions enforcement, FCPA violations, and due diligence under the Patriot Act and Bank Secrecy Act. With extensive expertise in asset tracing, financial fraud, and global compliance strategies, Strong delivers high-level investigative insight to 5Si's government, corporate, and private-sector Clients, helping navigate risk in today's interconnected threat landscape.
• Matthew Germanowski, a Director at 5Si, oversees investigative efforts for U.S. congressional committees and serves as a key leader on 5 Stones' federal contracts, including the IRS Criminal Investigation SAISS contract and the Department of State's international training programs. As a former DEA Special Agent, Germanowski held high-level classified roles within the DEA's Special Operations Division and Office of Professional Responsibility. He led global narco-terrorism and money laundering investigations, briefed the Attorney General, and directed internal affairs oversight as Deputy Chairman of the Board of Professional Conduct. A seasoned instructor, he has delivered advanced training in over a dozen countries on undercover operations and transnational organized crime. Germanowski is also a committed Christian and mentor to aspiring government professionals.
• John Gazzarra, a Director of 5Si, brings decades of high-level experience in both federal law enforcement and corporate security. A former DEA Special Agent, Gazzarra led complex international investigations in high-threat environments before transitioning to a senior security leadership role at Coca-Cola. He is a bilingual (English/Spanish) Subject Matter Expert in global security, risk mitigation, crisis management, and high-stakes investigative strategy. Known for his ability to navigate multinational investigations with precision, Gazzarra currently oversees the expansion of 5Si's Commercial and Private Client operations worldwide.
• Louis Sastre, 5Si Director of Surveillance Operations, is a seasoned surveillance specialist with over 20 years of field experience, including service as a DEA Miami Task Force Agent. He has led sophisticated physical surveillance operations across the U.S., South America, Asia, and the Middle East. Sastre is a Subject Matter Expert in deploying and managing a wide range of surveillance technologies—including sensors, video systems, and real-time coverage solutions—to support global intelligence and investigative missions. He now directs surveillance operations for 5Si's government and private-sector Clients.
• Grayson Blake, 5Si Director of Science & Technology Services, leads 5Si's innovation in Open-Source Intelligence (OSINT) and digital investigative technologies. Blake specializes in OSINT research, online data collection, and complex digital footprint analysis. He designs and implements advanced intelligence workflows that transform raw data into actionable insights. Recognized as a thought leader in AI and tech-enabled investigations, Blake guides teams in expanding 5Si's digital capabilities to support global intelligence and investigative objectives with precision and speed.
• Matthew Tinsley, 5Si Chief of Staff, coordinates all agency operations to ensure exceptional service delivery across the firm's global Client base. A certified Personal Protection Specialist (PPS), Tinsley previously led 5Si's Global Surveillance and Protection Operations, with field experience spanning the U.S., Israel, and the West Bank. He holds degrees from Lee University (Global Business) and Tennessee Wesleyan (MBA). He has completed executive programs at Oxford Saïd, Yale, and MIT—where he earned certifications in Blockchain, AI, and Digital Currency tracing. Tinsley is also Chainalysis Reactor Certified (CRC). He has trained with the Israeli Shin Bet, the Executive Protection Institute, and Gunsite Academy, among others, with specialized expertise in advanced firearms, tactical systems, and threat mitigation.

"The caliber of talent joining and advancing within 5Si is extraordinary," added 5Si Founder David Tinsley. "These individuals bring decades of specialized expertise, proven leadership, and unmatched dedication to service. Their collective skills reinforce our mission to deliver world-class intelligence and investigative solutions for every Client we serve, no matter the complexity or scale of the challenge. We're proud to welcome these exceptional professionals to the 5Si team."

5 Stones intelligence (5Si)® is a leading U.S.-based intelligence and investigations firm founded in 2007, with offices in Miami, Washington D.C., and global operations across Europe, the Middle East, Asia, Africa, and the Americas, delivering full-spectrum solutions in human intelligence (HUMINT), forensic investigations, financial and technical intelligence, risk mitigation, AML compliance, and protective services, for government, corporate, legal, and nonprofit Clients. Staffed by elite professionals from the FBI, DEA, CIA, and global military and law enforcement, 5Si operates the world's largest private HUMINT network, providing mission-critical intelligence with integrity, discretion, and international reach. Learn more at 5stonesintelligence.com.

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"The caliber of talent joining and advancing within 5Si is extraordinary. Their collective skills reinforce our mission to deliver world-class intelligence and investigative solutions for every Client we serve." –5Si Founder David Tinsley