Brin's Google co-founder Larry Page takes the No. 20 position with $23 billion to his credit. His company stock is up nearly 30 percent over the past year, yielding a personal impact in excess of $4 billion. Page has recently been focused on mobility technologies, and also has been evaluating opportunities in the area of clean energy, such as innovative fuel cells, geothermal energy and rainwater capture, according to Forbes. Both Page and Sergey Brin also have invested in electric cars, and Page reportedly also has invested with former Google CEO Eric Schmidt in a forward-looking initiative to mine asteroids in space.