Simone de Beauvoir (1908–86) was a French existentialist philosopher. Her works include Ethics of Ambiguity (1947) and The Second Sex (1949). Barbara Klaw is a professor emerita of French at Northern Kentucky University. She is the translator of Diary of a Philosophy Student: Volume 2, 1928–29, and author of Le Paris de Beauvoir. Sylvie Le Bon de Beauvoir, adopted daughter and literary executor of Simone de Beauvoir, is the editor of Lettres à Sartre and other works by Beauvoir. Margaret A. Simons is Distinguished Research Professor Emerita at Southern Illinois University Edwardsville and the author of Beauvoir and The Second Sex: Feminism, Race, and the Origins of Existentialism. Marybeth Timmermann is a contributing translator and editor of Philosophical Writings and other works by Beauvoir. Klaw, Le Bon de Beauvoir, and Simons coedited Diary of a Philosophy Student: Volume 1, 1926–27 and Diary of a Philosophy Student: Volume 2, 1928–29.