 In 1995 Seelye Stevenson Value & Knecht, Sanders & Thomas and Lyon Associates were renamed STV Incorporated and merged into one company, STV Incorporated (STV), which is headquartered in New York City.STV Group, the parent company, is headquartered in Douglassville, Pennsylvania.In 2006, STV acquired Ralph Whitehead Associates (RWA), a consulting civil and transportation engineering firm based in Charlotte, North Carolina, to extend the corporation's geographic reach into the Southeastern United States as well as its capabilities in the bridge engineering and freight operations.