Simone Lucie Ernestine Marie Bertrand de Beauvoir was a French existentialist philosopher, writer, social theorist, and feminist activist. Though she did not consider herself a philosopher, nor was she considered one at the time of her death, she had a significant influence on both feminist existentialism and feminist theory.. Born 1908-01-09 in Paris, France. View the full bodygraph with type, strategy, authority, profile, centers, channels and gates.