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City. and card counting. and he did it until they kicked him out. it was a challenge. it wasn't for the money. it was the idea of being able to use your mind to trade profitably. >> eventually, john would become a trader at the philadelphia stock exchange and work with and mentor pete delici. >> john did everything to an extreme. so if he believed in something or he felt statistically or mathematically he had an edge, he would exploit that as much -- as big as he could. >> part of john's strategy was to have competitors on the trading floor underestimate him. >> he wore scrubs on the floor bec...

Extreme. so if he believed in something or he felt that statistically or mathematically he had an edge, he would exploit that as much as -- or as big as he could. >> part of john's strategy was to have competitors on the trading floor underestimate him. >> he wore scrubs on the floor because he wanted people to think he was, you know, a goofball and didn't know what he was doing. >> but john did know what he was doing and became a multimillionaire, but wealth didn't necessarily bring happiness. >> i think he was a tortured genius. there were times when his depression could last for a period of...

Whiz. and decided to use his math skill his in casinos. >> he started going to atlantic city. and card counting. and he did it until they kicked him out. it was a challenge. it was not for the money. it was the idea of being able to use your mind to create profitably. >> eventually, john would become a trader at the philadelphia stock exchange and work with and mentor pete delici. >> john did everything to an extreme. so if he believed in something or he felt that mathematically he had an edge, he would exploit that as big as he could. >> part of john's strategy was to have competitors on the ...

Him out. it was a challenge. it was not for the money. it was the idea of being able to use your mind to create profitably. >> eventually, john would become a trader at the philadelphia stock exchange and work with and mentor pete delici. >> john did everything to an extreme. so if he believed in something or he felt that mathematically he had an edge, he would exploit that as big as he could. >> part of john's strategy was to have competitors on the trading floor underestimate him. >> he wore scrubs on the floor because he wanted people to think he was you know, a goof ball and didn't know wh...