Sean Mattingly serves as Chief Executive Officer of Valiant Integrated Services, a leading provider of mission-critical solutions for the U.S. government and its international partners. In this role, he is responsible for driving enterprise growth, shaping strategic initiatives, managing global operations, and executing business plans, while also spearheading the development of innovative technologies and capabilities.

Sean brings more than three decades of senior leadership experience as an executive in the private sector and with the United States Marine Corps. Sean’s extensive experience ranges from operations management to strategic growth and customer engagement within the defense and services industry. Before joining Valiant, Sean served as the Senior Vice President of Operations at J&J Worldwide Services, where he was responsible for business units that focused on engineering, mission support, and building maintenance. Prior to his time at J&J, Sean spent more than a decade at Serco Inc. where he held multiple executive leadership positions of increasing responsibility, including Business Unit Vice President and Managing Director of Serco's Federal Government Business line. Sean's broad experience with day-to-day business operations, his familiarity with federal and state customers, and his proven success with growth strategy planning position him to lead Valiant into the future.

Prior to entering the private sector, Sean served as a helicopter pilot in the U.S. Marine Corps. Sean received his master’s degree from the Marine Corps Command and Staff College and an undergraduate in business administration from Clayton State University. Sean and his family reside in Virginia.