In her biography (published in English as Becoming Beauvoir: A Life ), Kate Kirkpatrick uses newly available diaries and letters to challenge the long-held image of Beauvoir as a mere "disciple" of Jean-Paul Sartre. Kirkpatrick presents Beauvoir as a rigorous, original philosopher in her own right, whose existentialist ideas often preceded or diverged from Sartre's. Key Themes of the Biography Simone de Beauvoir and existentialism | Kate Kirkpatrick