S.I. Newhouse Jr., who ran the Conde Nast publishing empire that included magazine giants such as Vanity Fair, Vogue and The New Yorker, died Sunday at the age of 89. Newhouse, who was known as “Si,” and his younger brother, Donald, inherited a publishing company from their father, Solomon I. Newhouse. While Donald oversaw the newspaper and cable television division of the privately held Advance Publications, Si Newhouse built up the glossy magazine empire. Together they built one of the largest private companies in the world, according to Forbes, with 2016 revenues estimated at $2.4 billion. Also Read: Glamour's Cindi Leive Becomes 4th.