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From Wikipedia:
John Patrick O'Neill (February 6, 1952 – September 11, 2001) was an American counter-terrorism expert, who worked as a special agent and eventually a Special Agent in Charge in the Federal Bureau of Investigation until late 2001. In 1995, O'Neill began to intensely study the roots of the 1993 World Trade Center bombing after he assisted in the capture of Ramzi Yousef, who was the leader of that plot.
