How Julia Koch became one of the richest women in the world: the widow of billionaire David Koch inherited a family net worth of over US$60 billion ... and a very impressive property portfolio

• The philanthropist wife of the late David Koch has collaborated with The Metropolitan Museum of Art and American Museum of Natural History in New York
• She’s co-chaired at the Met Gala with Anna Wintour and Patrick McCarthy, and used to live at Jacqueline Kennedy Onassis’ former Fifth Avenue flat with her family