41 of 51
40. Rex Tillerson
40. Rex Tillerson
CEO, ExxonMobil

Already the world's largest oil refining and exploration company, Exxon became the largest gas producer on the planet when it acquired Texas-based XTO Energy in June for $31 billion. Meanwhile, the company's chemicals business, with revenues of $41 billion, is second only to Dow in the U.S. Now the oil giant is making a big push into alternate energy. This summer it invested $600 million to develop a biofuel refined from algae with Craig Venter's Synthetic Genomics.


NEXT: 41. Reid Hoffman
Last updated November 19 2010: 10:47 AM ET
After a month of rabid online voting you crowned your own Businessperson of the Year. More
Executives from Silicon Valley to Hollywood to Wall Street admires his savvy persistence - and his company's cool culture. The secret to the Netflix CEO's success? He never stops looking over his shoulder. More
Michael Dell was 21 when he first appeared in Fortune. Bill Gates made the cover when he was 30. Here's a look back at some of today's biggest business leaders when they were climbing the corporate ladder. More
Market indexes are shown in real time, except for the DJIA, which is delayed by two minutes. All times are ET. Disclaimer Morningstar: © 2014 Morningstar, Inc. All Rights Reserved. Disclaimer The Dow Jones IndexesSM are proprietary to and distributed by Dow Jones & Company, Inc. and have been licensed for use. All content of the Dow Jones IndexesSM © 2014 is proprietary to Dow Jones & Company, Inc. Chicago Mercantile Association. The market data is the property of Chicago Mercantile Exchange Inc. and its licensors. All rights reserved. FactSet Research Systems Inc. 2014. All rights reserved. Most stock quote data provided by BATS.