William Healy’s The Individual Delinquent, first published in 1915, is a landmark in the development of modern criminology, juvenile justice, and the scientific study of offenders. Based on five years of intensive research with more than a thousand young repeat offenders at Chicago’s Juvenile Psychopathic Institute, Healy challenged the prevailing search for a single explanation of criminal behavior. Instead, he argued that delinquency could be understood only by examining the individual offender and the complex interaction of psychological, physical, developmental, family, and environmental factors.

Healy’s central question remains strikingly contemporary: not simply what crime was committed, but why did this particular person commit it? His approach combined family and developmental histories, medical examinations, psychological testing, investigation of home and social environments, and extensive personal interviews. He emphasized diagnosis, prognosis, treatment, and follow-up rather than reliance upon punishment or abstract theories of criminality.

This Read-Me.Org Modernized-Classic makes Healy’s massive original work accessible to contemporary readers. The original volume of more than 800 pages has been abridged to approximately one-quarter of its length while retaining Healy’s organization and central arguments. The text has been rendered in modern English, representative case histories have been condensed, and editorial notes identify obsolete terminology and historically limited assumptions. Review and discussion questions make the volume particularly suitable for students and classroom use.

Both a historical document and a surprisingly modern argument for individualized justice, The Individual Delinquent illuminates the emergence of psychological and clinical approaches to crime and demonstrates why understanding the person behind the offense became a fundamental concern of twentieth-century criminology. Download the original book here.

Read-Me.Org Inc. New York-Philadelphia-Australia. 2026. p.114.