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 through the organization based on her leadership, professionalism, and operational expertise. Her progression through the ranks—from Security Specialist to Senior Security Specialist, Team Leader, and now Client Operations Manager—reflects her dedication to excellence and commitment to the company’s mission.

A United States Marine Corps Veteran, Liz served four years on active duty and two years in the reserves, where she developed a strong foundation in leadership, discipline, mentorship, and operational readiness. During her military service, she was responsible for mentoring and supervising junior Marines while maintaining the high standards and accountability expected within the Marine Corps.

In addition to her role with SENTRYSIX, Liz has gained valuable experience across multiple security and law enforcement environments, including service as a SERT Deputy with the Bexar County Sheriff’s Office, where she responded to emergency situations, maintained facility security, and worked in specialized response operations. She has also served as a Civilian Police Officer with the Department of the Air Force and as an Armed Driver Guard with Loomis Armored, further strengthening her operational security expertise and situational leadership abilities.

Liz is recognized for her calm leadership under pressure, critical thinking skills, attention to detail, and ability to build strong relationships with clients and team members alike. She is bilingual and possesses extensive training in crisis intervention, tactical response, emergency operations, and security management. Her professional accomplishments include earning the Navy and Marine Corps Achievement Medal and numerous specialized certifications in leadership, tactical operations, emergency response, and security training.

At SENTRYSIX, Liz continues to play a critical role in supporting clients, leading teams, and ensuring operational excellence across the accounts she manages.