A. J. (Aaron Joshua) Rosanoff

Born in Russia in 1878, Aaron Joshua Rosanoff became a psychiatrist in the United States and built his career during a period when mental health care was becoming more formalized and research-driven. He worked at Kings Park State Hospital in New York and became known as both a clinician and a teacher.

Rosanoff is especially associated with early intelligence and word-association testing, and with efforts to classify mental disorders in a more systematic way. He also wrote on heredity and psychiatry, reflecting major scientific interests of his time, even when some of those ideas are approached more critically today.

He died in 1943, but his name still appears in histories of psychiatry because of his role in shaping diagnostic thinking and psychological assessment in the first half of the 20th century.