They're paid a fortune — but for what, exactly? What makes a good C.E.O. — and how can you even tell? Is "leadership science" a real thing — or just airport-bookstore mumbo jumbo? We put these questions to Mark Zuckerberg, Richard Branson, Indra Nooyi, Satya Nadella, Jack Welch, Ray Dalio, Carol Bartz, David Rubenstein, and Ellen Pao. (Part 1 of a special series, "The Secret Life of C.E.O.'s.")

Mark Zuckerberg's dentist dad was an early adopter of digital x-rays. Jack Welch blew the roof off a factory. Carol Bartz was a Wisconsin farm girl who got into computers. No two C.E.O.'s have the same origin story — so we tell them all! How the leaders of Facebook, G.E., Yahoo!, PepsiCo, Microsoft, Virgin, the Carlyle Group, Reddit, and Bridgewater Associates made it to the top. (Part 2 of a special series, "The Secret Life of C.E.O.'s.")

Carol Bartz, CEO of Autodesk, talks about adapting to market changes, global strategies, and the impact of digital era on business operations. She emphasizes continuous learning, work-life balance, and taking on diverse roles for career growth. Additionally, she discusses the importance of competition, corporate governance, employee engagement, and personal commitments to community and education.