 Poincaré joined the French Academy of Sciences in 1887 and became its president in 1906. He was elected to the Académie Française in 1908 on the basis of his three books on philosophical and general problems in science. He also became a corresponding member of many international scientific organizations. His travel included a trip to America to give a lecture at the St. Louis World’s Fair in 1904. Poincaré’s extensive correspondence demonstrates the extent of his connection to the scientific community of his time (Nabonnand 1999; Walter 2007, 2016). He also co-signed a report that played an important role in the rehabilitation of Dreyfus (Rollet 1999).