New York's attorney general said it found Tillerson had used an email address under the pseudonym "Wayne Tracker" for at least six years.
Evidence seems to contradict the secretary of state nominee and former Exxon Mobil CEO's claims at confirmation hearing.
American diplomats documented some of Rex Tillerson’s global dealings in State Department cables leaked to WikiLeaks in 2010.
The SEC is investigating whether the oil giant ignores or lies about how market fluctuations affect its profits.
Sowing doubt about fossil fuels' effect on climate change has parallels to the tobacco industry's deception on the dangers of smoking.
"The world is going to have to continue using fossil fuels, whether they like it or not," said the energy giant's CEO.
Unless Mexico invites in foreign oil investors soon, a country with the world’s second-largest untapped crude reserves could become a net energy importer.