 Under the leadership of Texan George Clifford, the company began to build interstate gas pipelines and compressor stations and also became the largest single stockholder in the Tennessee Gas Transmission Company (Tenneco).The company was also retained on tasks that helped shift the nation's economy from a defense to a civilian basis, such as estimating the costs of deactivation and stand-by maintenance of defense plants and shipyards, providing technical advice and services on Japanese reparations, evaluating the mobile equipment that remained in overseas theaters, and continuing work at Oak Ridge.Stone & Webster was perhaps the most significant engineering company to be involved in the nation's developing nuclear power industry.