Jacob Sergi Kasanin (1897-1946)[1] was a Russian born, American trained psychiatrist who introduced the term acute schizoaffective psychoses in 1933.

[1] From 1928 to 1932 he was a Senior Research associate at Boston Psychopathic Hospital studying social causes of Mental disorder.

[1] When Director of the Department of Mental Hygiene of the Federated Jewish Charities in Boston his research interest was blood sugar curves in Epidemic encephalitis.

[7] Whilst at the Michael Reese Hospital he conducted research with Eugenia Hanfmann on Schizophrenic thinking this was following on from Vygotsky's work and was funded by the Masonic Foundation.

[8] From 1939 he was Chief of Psychiatry at Mount Zion Hospital in San Francisco and Assistant Clinical Professor at UCSF School of Medicine.