Around this time, he and his family had professional, educational and social connexions with well-known and to-be-famous people, such as physicists Paul Langevin and Satyendra Nath Bose, the latter who was on a two-year visit to Europe see photo (and whose knowledge of Hebrew impressed his family), socialite Philippe de Rothschild, racing driver , industrialist and racing driver André Dubonnet and film maker .