Man in funny hat is Guy de Rothschild and he's long since dead. His son David Rene de Rothschild heads the French branch of the family. David Rene is shown in your other pic.
Guy rode out WWII in NYC. His son David Rene de Rothschild is chairman of the Jewish World Congress and bears an uncanny resemblance to the late David Koch. The two davids were about the same age.
The Koch family fortune seemed to really take off after WWII. Same types of oil services businesses as the French Rothschilds specialized in before the Nazis appropriated it all.
Until his recent passing, David Koch lived in the same building in NYC as Ronald Lauder.
It's a funny world.