5. Charles Koch

• Net Worth: $25 B                                                                 
• Source of Wealth: diversified, inherited and growing
• Citizen: United States
• Age: 78

An alumnus of Massachusetts Institute of technology, he is the fifth richest man along with his brother David in America. He owns a forty-two percent stake in Koch industries. He is at position #41 in the list of most powerful people in the world by Forbes. Along with his brother, he forms one of the richest billionaires family.