9. Larry Ellison, 74,Oracle (software), $58.5 B
Oracle CEO Larry Ellison gestures while giving a keynote address at Oracle OpenWorld in San Francisco, Tuesday, Oct. 2, 2012. Ellison says he plans to turn the Hawaiian island that he recently bought into a laboratory for experimenting with more environmentally sound ways of living. Ellison says he hopes to convert sea water into fresh water on the 141-mile-square (365-square-kilometer) mile island of Lanai. He also wants more electric cars on the island and hopes to increase its fruit exports to Japan and other markets. (AP Photo/Eric Risberg)