[1][2] He was part of a handful of men who disseminated European ideas about psychopathology, especially in understanding dissociative phenomenon; and helped found the Journal of Abnormal Psychology in 1906, which he edited until his death.

[3] Prince later in life learned that part of his family were descended from early American Sephardic Jews, and became interested in philanthropy and concerns of his ancestral community.

During the First World War at Hotel Lotti, Paris, France, Dr Prince was the director of an information bureau and home[4] intended for soldiers and sailors from Massachusetts.

Prince became interested in abnormal psychology and neurology because both his wife and mother had psychogenic symptoms including depression and anxiety.

Overall, Prince had six of his books published and had written over 100 scientific papers that included information on general medicine, philosophy, neurology, and psychopathology.

Though his psychological ideas never took hold, he remained an eminent figure, Carl Jung for example contributing to his festschrift of 1925, Problems of Personality: Studies Presented to Dr. Morton Prince.

That clinic established a major American stronghold for wide-ranging psychological researches into personality that included a number of the luminaries of that field (Henry Murray, Gordon Allport, and Robert W. White), who all became famous extending the ideas that Prince first taught them.

Prince stressed the importance of the subconscious to hysterical symptoms at the same time as Freud, but he was critical of psychoanalysis - arguing to Putnam for example that "You are raising a cult not a science"[9] - and preferred to outline his idiosyncratic position that never became popular.