US Serena Williams celebrates after winning against Russia's Maria Sharapova at the end of their WTA Qatar Open semi-final tennis match on February 16, 2013 in the Qatari capital, Doha. Williams won 6-3, 6-2. (AFP/Getty Images)
From underwater mining to luxury yachts, Mohammed Al Barwani has interests in a staggering range of industries. The chairman of MB Holding explains how he built the firm from scratch to become a billion-dollar player.