Shannon & Wilson, also known as S & W,[6] is an American geotechnical engineering and environmental consultancy firm headquartered in Seattle, Washington founded in 1954.[2] It was founded by William L. Shannon and Stanley D. Wilson (de), both of whom are alumni of Harvard University.[7] The firm does various forms of work from geotechnical, geological, and environmental services ranging from natural resource management to geophysical surveying for public and private sectors. The company’s markets include dams and levees, design and construction, energy, federal, industrial, property development, transportation, wastewater management, and waterfront facilities.[2] However, over half of their work is devoted to retrofitting and performing safety investigations on transportation projects.[5]