Headquartered in Fairfax, Virginia, ECS has more than 2,700 employees throughout the U.S. We are proud to build successful customer relationships with some of the world’s leading agencies in both the public and private sectors. Inspired by the ability to create, innovate, and serve, our highly skilled teams work together to solve complex challenges and provide advanced technology, science, and engineering solutions.ECS is a segment of ASGN Inc.