For the past 10 years, Jesus Leonardo has been cleaning up at an OTB parlor in Midtown Manhattan, cashing in, by his own count, nearly half a million dollars’ worth of winning tickets from wagers on thoroughbred races across the country.

During his glorious run, Mr. Leonardo, 57, has not placed a single bet.

“It is literally found money,” he said on a recent night from his private winner’s circle. He spends more than 10 hours a day there, feeding thousands of discarded betting slips through a ticket scanner in a never-ending search for someone else’s lost treasure.

“This has become my job, my life,” he said. “This is how I feed my family.”

Leonardo, who favors track suits and wears his graying hair and bushy beard in long ponytails, is what’s known in horse racing parlance as a stooper  a person who hangs around racetracks and betting parlors picking up tickets thrown away by others. Most tickets are losers, but enough are winners to make it worth his while.

To his stable of OTB buddies, Mr. Leonardo is the Secretariat of stoopers.

“He’s a legend,” said Paul Pepad, 57, an out-of-work musician who lives in Manhattan. “Everyone knows that this is his turf, that all the tickets thrown out belong to him, period. It’s just been that way as long as I can remember.”