Recently , when the two men were having breakfast at the Four Seasons , various targets -- past and present -- of Mr. Spitzer were seated near them in the room , including Sanford I. Weill , the former chief executive of Citigroup , which was among the Wall Street firms investigated over conflicts surrounding analyst research , and Kenneth Langone , a former head of the New York Stock Exchange 's compensation committee that approved a $ 140 million payout to the former exchange chief , Richard A. Grasso .