According to the ranking , he is the seventh-richest person in New York City , behind David H. Koch , an industrialist and heir to an oil fortune ; Carl C. Icahn , a master of leveraged buyouts ; Rupert Murdoch , the chairman and chief executive of the News Corporation ; S. I. Newhouse Jr. , a publishing executive ; Leonard Blavatnik , a Russian-born industrialist ; and the financier Ronald O. Perelman .