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Day & Zimmermann offers services as distinct as day and night. Its family of companies provides engineering and construction, design, plant maintenance, security, staffing, munitions decommissioning, validation, and asset management services worldwide. A top global contractor, Day & Zimmermann provides operations, contract support, and maintenance services to US and foreign governments, as well as commercial customers. Its Day & Zimmermann NPS unit maintains half of the US's nuclear plants. Staffing subsidiary Yoh Services specializes in filling IT, engineering, and health care positions. Founded in 1901, Day & Zimmermann is owned and managed by the Yoh family, which has headed the firm for three generations.

Planning, design, and management services are the fruits of The Dewberry Companies' labor. The company provides architectural and engineering services, planning, program management, and surveying services, as well as environmental compliance, and security and homeland defense services. Dewberry serves private and public-sector clients. However, government customers such as FEMA, the Pentagon, and the US Department of Labor make up a big portion of business. Dewberry also serves departments of transportation, as well as universities, real estate developers and other commercial and institutional groups. Dewberry, which was founded in 1956, operates from more than 40 offices in nearly 20 states.

The Holland Roofing Group installs commercial and industrial roofing systems for clients throughout the midwestern and southeastern regions of the US. The company's services include new construction; roof replacement, repair, and maintenance; and roof coatings. Holland Roofing operates from locations in Florida, Indiana, Kentucky, Ohio, and Tennessee. President Hans Philippo founded Holland Roofing in 1986.

The Jerde Partnership is an architecture, landscape design, and urban planning firm specializing in what the firm calls "Jerde Placemaking," a concept by which it designs places where people can gather and share a sense of community, which then promotes investments in and revitalization of urban areas. The firm designs entertainment, retail, and mixed-use projects in Southern California and has developed innovative projects throughout the world. The Jerde Partnership has an office in Venice, California and international offices in Amsterdam, Hong Kong, and Shanghai. Chairman Jon Jerde founded the enterprise in 1977.

The Kleinfelder Group isn't afraid to get its hands dirty. Since its start as a materials testing lab in 1961, the company has expanded to become one of the largest engineering consulting and design groups in the US. Kleinfelder's operating subsidiaries offer soils and materials testing, geotechnical engineering, construction management, and environmental services. With about 50 domestic offices and locations in Australia and Guam, the group targets the energy, transportation, water, commercial/industrial, government, and education markets; projects run the gamut from building underground parking garages to establishing wind farms. Jim Kleinfelder, who retired in 1993, founded the employee-owned company.

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