Which theorist published research related to the psychology of personality?

Sigmund Freud

Explanation:

Sigmund Freud's psychoanalytic theory explains the complex human personality through a series of stages and each stage is determined by a internal psychological conflict. According to this theory, human behavior is the result of three elements of the mind that are Id, ego, and superego. The interactions between these elements of the mind progress through five different psychosexual developmental stages.