Who is Bruno Zambotti from Confessions of an Economic Hit Man and what is their importance?

Bruno Zambotti is known as the silver fox because of his hair and his ability to outmaneuver anyone who challenged him, he was John's mentor and the vice president of MAIN's electrical power division and of most of the international projects. He was also likely to take over as president of the company but was fired when the president of MAIN got jealous that Bruno was doing better for MAIN than he was.