Henry A. Murray was an American psychologist best known for his work in personality theory and projective testing. He developed the Thematic Apperception Test (TAT), a tool used to assess an individual's personality through storytelling based on ambiguous images. His research focused on understanding human motivation and the complexities of personality. Murray was also a key figure at Harvard University, where he contributed to the field of psychology for several decades. He emphasized the importance of understanding the individual within their social context and explored the interplay between personal needs and environmental factors in shaping behavior.