Whether the job is raising an entire city or razing a nuclear power plant, you can bet Bechtel Group will be there to bid on the business. The global engineering, construction, and project management firm serves the oil and gas, power, transportation, communications, mining, and defense and security sectors. Its Oil, Gas & Chemical business unit (particularly liquefied natural gas) and its Mining & Metals group are Bechtel's leading revenue producers. Founded in 1898, the contractor may be best known for building the Hoover Dam and its containment work at the Chernobyl nuclear plant.