Our Leadership

Sean O’Brien joined SCIS in late 2020 after serving with affiliate Securitas USA since 2012. During his time at Securitas, Sean has held sales, training, operations and executive roles. As a VP of Global National Sales, Sean was a founding member of the Securitas Global Clients Americas business development team and was personally responsible for signing over one billion dollars’ worth of secured contract revenue. Most recently before joining SCIS, Sean owned the P&L as the operations lead for Securitas in New York City as the Area Vice President over a team of over 800 employees. Now a part of SCIS, Sean leads business development efforts across both the federal and commercial environments.

Lisette Chreene became the senior Human Resources leader for Paragon and SCIS in 2021. Previously serving as the Vice President, Talent Development, for the entire 100,000 employee Guarding business unit at affiliate company Securitas USA, Ms. Chreene built a robust management training program and enhanced onboarding processes. Prior to that position, she spent nearly a decade as the Vice President, Human Resources for Securitas USA’s Pacific Region, supporting an employee base 17,000 strong. Ms. Chreene has held positions as a Training Manager at University Southern California (USC) and at Taco Bell, where she was a Manager with P&L responsibility for five locations.

Nicolas Re leads SCIS, focused on security for aerospace and defense industries. His role includes executive management, infrastructure development, operations oversight, and business development. Mr. Re joined Pinkerton Government Services, Inc. (now SCIS) through the acquisition of American Protective Services (APS) in January 2000. Previously, as a Program Manager on assignment with a large defense contractor, Mr. Re built and managed a security workforce for multiple locations in the Twin Cities, Minnesota area. Since then, he has served as Branch Manager in Fort Smith, Arkansas and Fort Wayne, Indiana where he worked to develop existing business throughout the Midwest while building operational support for defense industry clients. For nine years, he served as Area Vice President for the Northern U.S and then two years as Vice President of Operations.

Angela Greaver moved into the Corporate Facility Security Officer role in April 2023. Prior to that, Ms. Greaver filled several roles in the industrial security department at both SCIS and Paragon. With over ten years of experience in industrial security leadership, Ms. Greaver has established and implemented company-wide cleared personnel auditing procedures. These procedures helped the company obtain multiple Superior DCSA ratings.