Die Psychologie des Verbrechers – Kriminalpsychologie was a book written by Dr. med. Paul Pollitz and published in Leipzig, Germany, in 1916. It is a summary of previous findings on psychological, social and economic characteristics of criminals for a variety of different crime types based on the statistics of the early 20th century. The focus lies on three main causes for committing crimes, which can interact or are presented in solitude. These causes depict crimes as a result of socio-economic circumstances, impaired psyche, and/ or personality of the criminal.