Eugène Carp (1895-1983) was one of the most prominent professors of psychiatry in the Netherlands during the first half of the 20th century. From 1930 until 1963 he was a professor of psychiatry in Leiden. His comprehensive textbook of psychiatry was based on psychodynamic theory. He introduced several forms of psychotherapy and promoted psychotherapeutic outcome research. His work on sociotherapy was essential for the introduction of clinical psychotherapy into the Netherlands.