Which individual developed a personality theory that included endomorphic,mesomorphic,and ectomorphic body types?

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William Sheldon developed a personality theory that included three body types - endomorphic (soft and round), mesomorphic (muscular and well-built), and ectomorphic (thin and fragile). Sheldon believed that each body type was associated with specific personality traits and that a person's body type could predict their temperament and behavior.

Which Individual Developed a Personality Theory That Included Endomorphic,mesomorphic,and Ectomorphic