This document summarizes the development of criminology from the 18th century to today. It began as classical criminology focusing on religious explanations for crime. In the 19th century, modern criminology applied biological and behavioral sciences to study crime typologies and offender characteristics. Independent criminology emerged in the late 20th century as its own academic discipline, driven by increased government funding. Theories then incorporated social causes like imitation (Gabriel Tarde) and economic causes of lower socioeconomic status and crime. Finally, opportunity theories analyzed how environmental factors provide criminal opportunities rather than just motivation.