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Micky Arison

Team: Miami Heat
Net worth: $4.2 billion

The Miami Heat basketball team is owned by Micky Arison, the Israeli-American chief executive officer of Carnival Corp. Carnival is the largest cruise operator in the world, and it consists of 11 different cruise-line brands with over 100 ships. Carnival also owns Holland America Princess Alaska Tours, and altogether attracts 8.5 million pleasure seekers per year.

Carnival was co-founded in 1972 by Arison's father, Ted, who also formed the Miami Heat in 1988. After he died in 1999, control of both the Carnival Corp. and the team passed to Micky Arison, whose net worth is $4.2 billion as of September 2011.

Recently, the company came under fire when the cruise ship Costa Concordia, which is owned by Carnival, ran aground off the coast of Tuscany on Jan. 13, killing 17 people.

Marc Serota | Getty Images