Cazalot was president of Texaco (now part of Chevron, the biggest greenhouse gas emitter in history, according to a study by Richard Heede) from 1992 to 2000. He was the CEO of Marathon from 2002 to 2013 Cazalot currently serves on the board of directors at Spectra Energy.
Under his leadership, in 2012, Marathon Oil spent over $2 million on lobbying.
Cazalot is a member of the All-American Wildcatters Association, a private club of oil industry insiders.
Cazalot, who expects fossil fuel use to increase by 50 percet between 2007 and 2030, causing more carbon dioxide pollution, but says the best solution is to capture carbon dioxide and store it underground.
In 2009, Cazalot urged Marathon employees, suppliers and customers to oppose climate legislation sponsored by Representatives Waxman and Markey, describing it as "an enormous hidden tax on all Americans" and threat to the economy.
Cazalot is on the board of directors of Baker Hughes.