Sigmund Freud although one of the best-known personalitytheorists is probably also one of the most controversial in thefield of psychology. When starting to consider theories ofpersonality one must begin with a look at Sigmund Freud as he wasone of the first theorists to develop a psychoanalytical theorythat was based on real-life patients and not studies conducted in alab. Even if you do not agree with his theories he is the startingpoint from which many other theorists have begun. Specifically hewas concerned with the development of the personality and how itcreated the neuroses he saw in many of his patients.