Cesar Mata Pires was born in Brazil. Cesar Mata Pires debuts on Forbes' list of the World's Billionaires this year thanks to his 90% stake in privately held Brazilian contractor OAS S.A. OAS, of which he is a cofounder, is in businesses including petrochemicals and energy, and operates several highway concessions in Brazil. The company is one of the biggest winners in the building boom leading up to this year's World Cup soccer tournament and the 2016 Summer Olympics, both of which are being held in Brazil. Mata Pires became a target of demonstrators who took to the streets ilast year, protesting government spending for both events. He is married to Tereza Magalhaes, the daughter of the late Brazilian Senator Antonio Carlos Magalhaes, whose estate of $200 million was the impetus behind a family feud that ended last May when Mata Pires and his wife gave up their rights to the inheritance.