File photograph of Sokol, Chairman, MidAmerican Energy Holdings, and Chairman, President, and CEO of NetJets in Dana Point

 
File photograph of Sokol, Chairman, MidAmerican Energy Holdings, and Chairman, President, and CEO of NetJets in Dana Point
David Sokol, Chairman, MidAmerican Energy Holdings, and Chairman, President, and CEO of NetJets, listens to a question during the Fortune Brainstorm Green conference in Dana Point, California in this April 13, 2010 file photograph. FREUTERS/Mario Anzuoni/Files