Denny Teresi is a blind former phone phreak and radio disk jockey, most famous for being the person who introduced John Draper to the field. Both Draper and Teresi were operating pirate radio stations in the San Jose, California area. Their initial contact came when Teresi responded by telephone to one of Draper's pirate broadcasts.
In the documentary The Secret History of Hacking, Teresi is identified as an expert in social engineering. Teresi's mastery of the phone company's jargon allowed him to speak with phone company employees and trick them into revealing more information.
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