Barret Chappelle
Barret Chappelle serves as the Senior Program Manager for Federal Services at SENTRYSIX, where he leads complex federal programs supporting national security, defense infrastructure, and mission-critical operations. A mission-driven leader with more than 15 years of experience in military operations, federal project execution, and large-scale infrastructure management, Mr. Chappelle specializes in delivering high-risk, high-consequence programs in […]
Brian Vincente
Brian joined SENTRYSIX in 2025 after retiring as an Assistant Special Agent in Charge with Homeland Security Investigations (HSI) with over 30 years of federal law enforcement experience. He began his career with the United States Customs Service in Hidalgo, Texas and has held leadership roles, including DHS Attaché/HSI Regional Attaché in Bogota, Colombia, overseeing […]
Lizbeth “Liz” Cornelio
Lizbeth “Liz” Cornelio serves as a Supervisory Security Specialist and Client Operations Manager for SENTRYSIX, where she oversees client operations and serves as a primary point of contact for key accounts to ensure mission success, operational efficiency, and exceptional client service. Since joining SENTRYSIX in October 2011 as a Security Specialist, Liz has steadily advanced […]