He also worked as a bouncer for many years in New York city , where he learned that what he had been taught worked in real life situations .
Mr. Leff became a student and eventually a master of this system .
Leff also worked as a bouncer for many years in New York city , where Leff learned that what Leff had been taught worked in real life situations .
Mr. Leff became a student and eventually a master of this system .