Micky Arison

Choppy waters for captain of world's largest cruise ship operator: Carnival stock down 13% since last November as rising fuel costs make shuttling sunburned buffet connoisseurs a less lucrative proposition. Passing extra costs on to customers. Today operates 85 ships under 11 brands, including Carnival, Princess, Holland America, Costa Cruises, Cunard Line. Sales: $13 billion in 2007. Investing in new ships. Owns pro basketball's Miami Heat: NBA champs in 2006, NBA laughingstock last season.