Leonid Radvinsky’s widow has been left with a crucial role in deciding what happens to the business that made her husband a billionaire Yekaterina Chudnovsky, online biographies say, is a mother-of-four who “enjoys spending time with her family and teaching them the importance of giving back and helping others”. They add that Ukrainian-born Chudnovsky, known as Katie, finds sanctuary in walks on the beach. In interviews, Chudnovsky has spoken warmly about her commitment to philanthropy, her