4) Khalifa bin Zayed Al Nahyan, President of UAE – $15 Billion

Khalifa bin Zayed Al Nahyan is the President of UAE and also the Emir of Abu Dhabi. He assumed the office of the president in 2004 after the death of his father. His family is among the richest in the world. It has an estimated wealth of more than a whopping $150 billion! Khalifa bin Zayed Al Nahyan is the chairman of the Abu Dhabi Investment Authority. Even though he controls 97.8 billion barrels of proved oil reserves, not all his wealth is from oil. Currently he runs the world’s second-largest sovereign wealth fund, with assets of $773 billion!