Hydraulic fracturing, or fracking, which uses a high-pressure stream of water, chemicals and sand to blast through deep layers of shale rock to extract natural gas and oil, has become one of the most contentious energy issues of our time. But who are the people who made the shale boom happen? Zuckerman, a writer for The Wall Street Journal, spent most of his career covering business and finance and realized that natural gas development was the biggest business story of today. His latest book, The Frackers, profiles six energy tycoons. Among them is Harold Hamm, the oil and gas magnate who advised (and helped fund) Mitt Romney’s presidential campaign