Abstract
The work makes a study of the foundations of criminological thought in Colombia in the 1950s; to this end, the author examines the approaches contained in the book "Criminología. The new naturalistic conception of crime", written by the criminologist and great scholar of criminal law Luis Carlos Perez who, at that time, suffered a marked influence of the work of Cesare Lombroso, a cult of criminological positivism in Italy, who had much to do in the development of that discipline during the first half of the twentieth century; the national expositor, despite his positivist starting point, manages to lay the foundations of what would later be known as Critical Criminology.