No, Carlos Slim Helú is not a Jew. He is of Lebanese origins and a Maronite Catholic by religion.
This Mexican businessman and philanthropist made his fortune in the telecommunications industry and other ventures such as retailing, construction, banking, insurance, railroads and mining.
Carlos is said to be the richest man in the world. Slim's wealth was estimated at $53.5 billion by Forbes (2010).
Helú topped the Forbes list again in 2011 at $74 billion. Yes, that was quite a nice bump. In 2012 he held steady at $73 billion according to Forbes.
He made an investment in the New York Times in 2010, "a $250 million loan intended to help the newspaper company finance its businesses." /updated repost/