Two thousand people cheered as Joshua Sason walked up to a boxing ring at an arena in Providence late last year. He trailed the actor Miles Teller, and the crowd was made up of extras—they were shooting a boxing movie, directed by the guy who made Boiler Room. Sason got to make a cameo in the fighter’s entourage because he’s producing the movie with Martin Scorsese and put up the budget. He’s 27 years old.

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