In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

As a college student, he was one of ten people selected to attend the "World Student Christian Federation Conference" in China. After switching professions he embarked on a detailed study of Otto Rank's theories and created a theory expounded upon in his A Way of Being and On Becoming a Person. He introduced the notion of organismal valuing and positive regard on his way to advocating a plan that minimized the psychologist's talking in counseling. FTP, name this creator of nondirective or client-centered therapy.
Social Science