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    Frank William Abagnale was a world-famous con man by age 21. Now he runs a fraud consulting company.

    Between the ages of 16 and 21, Abagnale wrote $2.5 million in fraudulent checks and successfully posed as an airline pilot, doctor, lawyer and college professor. He was later apprehended by the French police and served five years in prison.

    Abagnale was released early under the condition that he'd work with the U.S. government.

    According to his firm's Web site, he works with consulting financial institutions, corporations and law enforcement agencies on fraud and security. To date, he has serviced more than 14,000 companies.

    His story was made into the film "Catch Me If You Can," which was directed by Steven Spielberg and starred Leonardo DiCaprio and Tom Hanks.