Griffith's gifts lie in general contracting services -- specifically road and bridge work and paving. The century-old company works mostly in Southern California and offers grading, paving, and concrete services, in addition to underground installation and material recycling. The engineering and heavy construction group specializes in transportation infrastructure and site development projects in the region. It also works on flood control and water management structures, airports, ports, and institutional, industrial, and commercial projects. The company, which was established in 1902 and held by the Griffith family for nearly a century, is now owned by its employees.

E-J Electric Installation, established in 1899 by Jack Enright and Theodore Joseph, has provided electrical contracting services almost as long as the electric industry has been around. The company offers a wide range of services, from small electrical maintenance projects to the construction of power plants. It designs, installs, and maintains communications networks through E-J Communication Systems. The company's Mutual Electric division handles retail projects. E-J also has worked in the transportation, data center, and health care, industries. Chairman J. Robert Mann and his family control E-J Electric Installation, which was acquired by Mann's father, Jacques, who first joined the firm in 1912.

Tetra Tech NUS, Inc., provides environmental consulting, engineering, and remediation services. Its expertise extends to such areas as air quality management, compliance services, environmental analysis and planning, health sciences, homeland security, information technology, radioactive and hazardous waste investigation and protection, and water and wastewater treatment. Now part of engineering giant Tetra Tech, the company stemmed from nuclear utility consulting and engineering firm Nuclear Utility Services Corporation (NUS Corporation), which was founded in 1960. Clients, including government agencies and commercial industries, are served through 17 offices across the US.

Dynamic Systems, Inc. (DSI) is dynamite with pipes. The company fixes and installs plumbing and exhaust systems (without blowing them to bits). The mechanical contractor specializes in HVAC (heating, ventilation, and air conditioning), plumbing, and sanitary and exhaust piping projects for facilities including cleanrooms, hospitals, high-rise office buildings, and industrial plants. Biopharmaceutical and semiconductor firms Biogen Idec and Infineon Technologies are among its clients. It serves others in the health care, hospitality, and commercial sectors. The company has regional offices in Arizona, Massachusetts, North Carolina, Texas, and Virginia. DSI is a holding of Austin, Texas-based FGI Group, Inc.

MJB Wood Group makes and distributes a multitude of wood products such as laminated veneer lumber, millwork and molding, paneling, fixtures, and door, window, furniture, and cabinet components. The company operates through manufacturing and distribution facilities in about a dozen states, primarily in the southern US. MJB also has operations in Mexico, Canada, China, and South America. In addition to its wood products, the company offers custom manufacturing, import/export assistance, inventory management, and supply chain management and logistics outsourcing services. MJB traces its roots to Tumac Lumber Company.

Interior Services Group has the inside scoop when it comes to building and refurbishing commercial buildings and providing tenant finishing services in the UK and beyond. Interior Services Group (ISG), which is made up of several operating units, has long been active in London, but has moved outward across England through acquisitions. It is also active in Continental Europe, the Middle East, and throughout Asia. ISG's primary experience includes corporate office buildings, retail locations, government and educational facilities, and leisure facilities like gyms, sports arenas, hotels, and restaurants. Its customers have included BP, Diageo, Leeds College of Music, Selfridges, and the London Stock Exchange.

Rocky Top Building Products produces pressure-treated lumber and engineered wood for residential, commercial, agricultural, industrial, marine, and recreational applications. The company's products include dimension lumber, decking boards, railing, beams, lattice, and related fastening systems. The company operates facilities in Maryland, Pennsylvania, and Virginia, and sells its products to professional builders and do-it-yourselfers through dealers in about a dozen northeastern and mid-Atlantic states. A wholly owned subsidiary of the Franklin Group, Rocky Top was established in 1977.

Therma Corporation is a mechanical contractor that specializes in the design, installation, and service of piping systems for the transmission of fluids and gasses. The company also designs and manufactures air-conditioning systems, duct systems, and clean rooms. It serves commercial, industrial, and biomedical concerns in Northern California. President Joe Parisi and CFO Nicki Parisi co-founded the company in 1967 to serve the burgeoning semiconductor and biomedical industries in the San Francisco Bay area. Its clients have included Intel, Varian, Texas Instruments, and Hewlett-Packard.

Ryan Consultants & Designers. The company specializes in civil works and environmental and energy projects for such government and commercial clients as the U.S. Navy, the U.S. Army Corps of Engineers, and MACTEC. It also handles energy conservation and communications projects. The women-owned and Hispanic-owned firm and has California offices in Los Angeles, Sacramento, San Diego, and San Francisco; it also has operations in Alexandria, Virginia. President and CEO Wanda M. Martinez, who named the enterprise after her nephews, owns the firm, which she launched in the 1980s.

Sierra Pacific Industries company owns and manages about 2 million acres of timberland in California and Washington. With a network of sawmills, it is among the top lumber producers in the US. SPI's manufacturing plants also produce mouldings and millwork, windows and doors, fencing, and wood fiber by-products, such as chips, bark, and shavings. Several of its sawmills also house cogeneration facilities that recycle wood waste into power for its plants; excess electricity is sold to local public utilities. Additionally, SPI is involved in residential and commercial real estate. The company traces its roots to the 1920s when it was founded by R. H. "Curly" Emmerson.

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