Helen Singer Kaplan was a prominent American psychiatrist and sex therapist, known for her pioneering work in the field of human sexuality. She was one of the first to integrate psychological and medical approaches to sexual dysfunction, emphasizing the importance of both emotional and physical factors in sexual health. Kaplan authored several influential books and articles, contributing significantly to the understanding of sexual behavior and therapy. Kaplan developed the Kaplan Model, which outlines a comprehensive approach to sexual therapy, focusing on desire, arousal, and orgasm. Her work laid the foundation for modern sex therapy practices and helped destigmatize discussions around sexual issues, making her a key figure in the field of sexology.