EVP, Gas, Power, and RenewablesCountry: Britain
2006 rank: 15
The Oxford-trained chemist's credentials are high octane - a career that spans 30 years at BP and includes stints at the exploration and finance divisions. One of Cox's challenges is to lead the company's clean- and alternative-energy movement. And though 2006 saw just a 3% profit increase, she recently worked out a deal with Rio Tinto, where she's a board member, to develop zero-emission coal technologies.