Carlos Slim Helú (Spanish pronunciation: [ˈkaɾlos esˈlim eˈlu]; born January 28, 1940) is a Mexican business magnate, investor, and philanthropist. From 2010 to 2013, Slim was ranked as the richest person in the world. Known as the "Warren Buffett of Mexico", Slim has extensive holdings in a considerable number of Mexican companies through his conglomerate, Grupo Carso, SA de CV, have amassed interests in the fields of communications, real estate, airlines, media, technology, retailing, and finance. Presently, Slim is the chairman and chief executive of telecommunications companies Telmex and América Móvil.