Open this photo in gallery: Billionaire investor George Soros arrives at the Schumpeter Award in Vienna, Austria, on June 21, 2019.LISI NIESNER/Reuters Anna Porter is a journalist, publisher and author of books including Buying a Better World: George Soros and Billionaire Philanthropy. Her latest is the novel Gull Island. It has been a big year for one of the world’s most controversial philanthropists. George Soros, who turned 93 last week, handed over the leadership of his Open Society Foundations to his 37-year-old son, Alex, in June. So given his international stature, intellectual interests and vigorous engagement in world affairs, this...