Louis Gallois, CEO of EADS, poses on board at the Airbus A380 in Hamburg, Germany. The world's largest passenger liner, built by the European aircraft manufacturer Airbus, is delivered to Emirates Airline. (Getty Images)
Vicki Hollub will become the most influential woman in the oil and gas industry when she takes over as CEO of Occidental Petroleum in May. In a bleak period for the sector, how will the future boss of one of America’s biggest energy firms cope with the challenges ahead?