Helen Singer Kaplan (February 6, 1929 – August 17, 1995) was an Austrian-American sex therapist and the founder of the first clinic in the United States for sexual disorders established at a medical school.

The main purpose of her dissertation is to evaluate the psychosexual dysfunctions because these syndromes are among the most prevalent, worrying and distressing medical complaints of modern times.

A psychologist and psychiatrist by training, Kaplan viewed human sexual response as a triphasic phenomenon, consisting of separate—but interlocking—phases: desire, arousal, and orgasm.

[...] I have spent my whole life devising solutions to people's problems, telling them that sex is not dirty or harmful, but a natural function.

'"[2] Two of her disciples are Ruth Westheimer and Hans-Werner Gessmann, a German psychologist and psychotherapist, he introduced 1976 in the Psychotherapeutic Institute Bergerhausen her sexual therapy approaches in conjunction with the humanistic psychodrama and hypnosis in Germany.

[9] In addition, she was survived not only by her children, but also by both her second husband Toys "R" Us founder Charles Lazarus and her grandchildren Alexander D'Addio and Wildon Kaplan.