Dr. Castillo's work involves the fields of Psychology, Psychiatry, Cross-Cultural Studies, Anthropology and Religion, and includes topics of mental illness and psychotherapy in all DSM-IV diagnostic areas, shamanism, and the cultural factors affecting dissociative disorders and the relationship of dissociative symptoms to schizophrenia and other psychotic disorders. He presents a client-centered model of assessment and diagnosis based on a holistic paradigm that integrates known biological, psychological, social, and cultural factors.