GBA and its subsidiaries, GBA Builders, LLC, Infrastructure Solutions, LLC, GBA Systems Integrators, LLC, and ViroCon, Inc. serve primary markets including transportation, water environment, building design, site development, construction management, design-build services, general contracting for infrastructure markets, systems integration and commissioning. GBA employs a staff of 300+ headquartered in Lenexa, Kansas with regional offices in Missouri, Nebraska, Illinois, Iowa, Colorado and Texas.