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Ecology & Environment, Inc., an environmental consulting firm, provides professional services to government and private clients worldwide. It offers support services for response and site assessment activities related to the release and threat of release of oil, petroleum products, hazardous substances, and weapons of mass destruction or pollutants or contaminants; and undertakes task order contracts comprising various environmental assessment projects, engineering and oversight of pollution remediation, and other hazardous waste remediation activities, as well as prepares environmental impact assessment documents for federal land management agencies. The company also provides services to various phases of energy development by conducting critical feature/fatal flaw analyses, social and health impact assessments, feasibility and siting studies, field surveys, permitting, construction inspection, and compliance monitoring. In addition, it conceives and designs environmental restoration projects that restore affected habitat through the integration of biological and engineering solutions; offers sustainability, resiliency, and climate adaptation services, as well as environmental planning and assessment, and military master planning and land use compatibility study services; and provides water supply, water quality, and watershed management services. Further, the company offers logistical support, emergency response/management, and planning services in various preparedness, mitigation, response, and recovery phases, as well as conducts hazardous waste site evaluations providing site investigation, engineering design, and operation and maintenance. Additionally, it is involved in the management and financial planning; institutional strengthening and standards development; water supply and development; wastewater treatment; and solid waste project construction supervision assignments. The company was founded in 1970 and is headquartered in Lancaster, New York.

Hill International, Inc. provides project and construction management, and other consulting services primarily for buildings, transportation, environmental, energy, and industrial markets. The company offers program management, project management, construction management, project management oversight, troubled project turnaround, staff augmentation, project labor agreement consulting, commissioning, estimating and cost management, and labor compliance and facilities management services. It primarily serves the United States federal, state, and local governments; other national governments; and the private sector. The company operates in the Americas, Europe, the Middle East, Africa, and the Asia Pacific. Hill International, Inc. was founded in 1976 and is headquartered in Philadelphia, Pennsylvania.

Mistras Group, Inc. provides technology-enabled asset protection solutions in the United States, other Americas, Europe, and the Asia-Pacific. The company offers non-destructive testing services; inline inspection for pipelines; and plant condition management software. It also provides maintenance and light mechanical services, such as corrosion removal, mitigation and prevention, insulation installation and removal, electrical, heat tracing, industrial cleaning, pipefitting, and welding; engineering consulting services primarily for process equipment, technologies, and facilities; and utilizes scaffolding and rope access to access at-height and confined assets. In addition, the company offers certified divers for subsea inspection and maintenance; unmanned aerial, land-based, and subsea systems for inspection applications; online condition-monitoring solutions; quality assurance and quality control solutions for new and existing metal and alloy components, materials, and composites. Further, it builds monitoring systems, as well as provides inspection, maintenance, monitoring and data services; and Web-based solutions. Additionally, the company designs, manufactures, and sells acoustic emission sensors, instruments, and turnkey systems for monitoring and testing materials, pressure components, processes, and structures; and ultrasonic testing equipment. It serves oil and gas, aerospace and defense, fossil and nuclear power, power generation and transmission, civil infrastructure, manufacturing, industrial, public infrastructure, petrochemical, transportation, and other process industries, as well as infrastructure, research, and engineering industries. Mistras Group, Inc. was founded in 1978 and is headquartered in Princeton Junction, New Jersey.

VSE Corporation operates as a diversified aftermarket products and services company in the United States. The company operates through two segments, Aviation and Fleet. The Aviation segment provides aftermarket parts supply and distribution; maintenance, repair, and overhaul services for components and engine accessories supporting commercial, business, and general aviation operators. This segment serves commercial airlines, regional airlines, cargo transporters, MRO integrators and providers, aviation manufacturers, corporate and private aircraft owners, and fixed-base operators. The Fleet segment offers parts supply, inventory management, e-commerce fulfillment, logistics, supply chain support, and other services to support the commercial aftermarket medium- and heavy-duty truck market. This segment also provides sale of vehicle parts and supply chain services to support client truck fleets, as well as sustainment solutions and managed inventory services to government and commercial truck fleets. VSE Corporation was incorporated in 1959 and is headquartered in Alexandria, Virginia.

Willdan Group, Inc., together with its subsidiaries, provides professional, technical, and consulting services primarily in the United States. It operates in two segments, Energy, and Engineering and Consulting. The Energy segment offers comprehensive audit and surveys, program design and implementation, master planning, demand reduction, grid optimization, benchmarking analyses, design engineering, construction management, performance contracting, installation, alternative financing, measurement and verification services, and software and data analytics, as well as energy consulting and engineering, turnkey facility and infrastructure projects, and customer support services. The Engineering and Consulting segment provides building and safety, city engineering and code enforcement, development plan review and inspection, disaster recovery, geotechnical and earthquake engineering, planning and surveying, contract staff support, program and construction management, structural engineering, transportation and traffic engineering, and water resources services. This segment also offers district administration, financial consulting, and federal compliance services. It serves public and governmental agencies, including cities, counties, redevelopment agencies, water districts, school districts, and universities; investor and municipal owned energy utilities; state and federal agencies; and commercial and industrial firms, as well as various other special districts and agencies. The company was founded in 1964 and is headquartered in Anaheim, California.