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WASHINGTON, DC - May 12: Rex Tillerson, chairman and CEO of Exxon Mobil Corp., during the Senate Finance hearing on oil and gas tax incentives. Other witnesses were: John Watson, chairman and CEO of Chevron Corp.; Marvin Odum, U.S. President of Shell Oil Co.; H. Lamar McKay, chairman and president of BP America Inc.; and James Mulva, chairman and CEO of ConocoPhillips. (Photo by Scott J. Ferrell/Congressional Quarterly)

WASHINGTON, DC - May 12: Rex Tillerson, chairman and CEO of Exxon Mobil Corp., during the Senate Finance hearing on oil and gas tax incentives. Other witnesses were: John Watson, chairman and CEO of Chevron Corp.; Marvin Odum, U.S. President of Shell Oil Co.; H. Lamar McKay, chairman and president of BP America Inc.; and James Mulva, chairman and CEO of ConocoPhillips. (Photo by Scott J. Ferrell/Congressional Quarterly)

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