Williams Industrial Services Group, Inc. engages in the provision of construction, maintenance, and specialty services to the oil and gas, power generation, and other heavy industrial markets. Its services include general plant and modifications, outages, shutdowns turnarounds, extended power uprates, craft labor management, tools and equipment management, facility management, water and wastewater treatment, power generation, insulation, roofing, and structural restoration. The company was founded by Mercer Williams in 1958 and is headquartered in Wilmington, DE.