We solve complex risks for

critical individuals and institutions.

Charles Marino

Chief Executive Officer

Mr. Marino is an internationally recognized national security expert, news contributor, strategic advisor, and bestselling author. A former executive with the United States Secret Service (USSS) and Senior Advisor to the Secretary of the Department of Homeland Security, he serves on security panels around the world to share his expertise and is a regular contributor to major cable news networks. Mr. Marino served as a Supervisory Special Agent in the USSS under three Presidents, where he ensured individual and family safety across various locations and while in-transit. He also led a 1,300-member Electronic Crimes Taks Force to effectively investigate complex financial and cyber-crimes for the USSS in partnership with private sector and law enforcement partners.

Nikki Rutman

Managing Partner - Global Intelligence

Ms. Rutman has over 20 years of experience in the US Intelligence Community (USIC). Much of her time was spent with the Federal Bureau of Investigation, where she has experience building and growing intelligence programs as well as writing and briefing intelligence products. She previously worked for the Director of National Intelligence as an Adviser on Terrorism to a Mission Manager and as a counterintelligence analyst with the Defense Intelligence Agency. In the private sector, she built the intelligence program at Moderna, a pharmaceutical company based in Cambridge, Massachusetts.

Keith Gessner

Managing Partner - Private Client Services

Mr. Gessner brings over two decades of federal service to Sentinel, including his tenure as a U.S. Secret Service Special Agent. Notably, he spent five years with the elite Presidential Protective Division, where he safeguarded U.S. Presidents, foreign heads of state, and senior government officials. Keith's vast U.S. government and private sector experience encompasses protective design, operations, investigations, and client relations and his proven leadership will continue to guarantee exceptional service to Sentinel’s diverse and growing client base.

Sarah Smith

Chief of Staff

Ms. Smith has built a career at the intersection of intelligence, leadership, and mission execution with senior leaders across the FBI, ODNI, and the broader defense community. She most recently served as Executive Officer for the Cyber Threat Intelligence Integration Center, advising on high-stakes cyber strategy and interagency coordination. Her earlier roles include Chief for ODNI’s Senior Executive Management Office and key leadership posts at the FBI focused on enterprise planning and organizational performance.

Stacy Aguilar

Director of Operations

Ms. Aguilar's expertise spans the sports industry, including pivotal roles in international competitions and football developments with FIFA, Concacaf, and the United States Soccer Federation. Her career includes spearheading credential and access management at the Chase Center in San Francisco, home of the Golden State Warriors, and overseeing COVID - 19 protocols for Major League Baseball. Her work as a match and venue coordinator for Concacaf, along with her role in team ser vices operations for the United States Soccer Federation, highlights her broad experience and commitment to excellence in sports.

Mark Sullivan

Senior Advisor

Prior to entering the private sector, Mr. Sullivan was the Director of the USSS from 2006 to 2013. Throughout his career, he was responsible for the protection of the President, Vice President, former Presidents and their families, other Government leaders and visiting Heads of State. Mr. Sullivan led high impact initiatives in protective operations and intelligence, criminal investigations, strategic planning, threat assessment and risk management, and IT modernization. In the private sector, Mr. Sullivan has worked with clients on a variety of domestic and international issues regarding cyber security, financial fraud, intellectual property theft, business due diligence, and major event security planning and execution.

Lance Hamilton

Senior Advisor

Mr. Hamilton is a former Senior Intelligence Service (SIS-4) Executive, Operations Officer and 31-year veteran of the Central Intelligence Agency’s (CIA) National Clandestine Service. Hamilton served as Chief of Station for three of the CIA's flagship stations in the Middle East, Southeast Asia and Eastern Europe. He led some of the U.S. Government’s most significant Counter-Terrorist Operations for six years post 9/11, resulting in thwarted attacks and enhanced protection of the U.S. homeland.

Christian Connors

Advisor

Mr. Connors founded R Connors Sales (RCS) in 1994 to provide trusted representation and innovative solutions to defense and technology partners across New England. He has supported the successful market entry and growth of several defense and security technology companies, including Cobham and Aethercomm (later acquired by Veritas Capital). Mr. Connors led the introduction of BBM Technologies’ Boomerang Snider Detection System to the Department of Defense, generating over $250 million in new business prior to its acquisition by Raytheon.

Advisor

Jaimy Chadam

Advisor

Mr. Chadam creates bespoke solutions at the intersection of Tech, Telecom, Software, and Media - often leveraging Bering’s global network to help clients navigate both crisis and opportunity. Known for introducing the right partners, he brings a trusted, client-first approach. Previously a Senior Partner at EY-Parthenon and Accenture Strategy, he has worked with over 100 companies across the globe on everything from $25B deals to micro-marketing tests.

Advisor

Nick Moran

Advisor

Mr. Moran is a twenty year British military veteran with an extensive special operations background. He has served across the globe on operations, routinely alongside U.S. forces, and also on secondment to government departments across Intelligence and Security. He holds a Masters in International Affairs. Mr. Moran leads Bering Global within Blacklake Group. Bering Global is Sentinel’s partner on several major security projects.