25. Carlos Slim Helú

Title: Founder, América Móvil and Grupo Carso

Country: Mexico

Age: 75

The richest man in Mexico, Carlos Slim Helú owns more than 200 companies in his home country — a conglomerate known as Slimlandia. He's also one of the wealthiest self-made people in the world, with a net worth of at least $27 billion.

His interests lie in the financial, industrial, telecommunications, and media sectors, and he invested $4 billion in 2015 to further expand his empire in Mexico. A savvy investor, Slim Helú bought a 6.4% stake in the New York Times for $127 million in 2008 after the stock had cratered, making him the largest shareholder. He has since increased his ownership to 17%, a stake worth $365 million thanks to The Times' resurgence.