The second edition of Criminal Justice Pioneers in US History presents a rich tapestry of biographies showcasing individuals who have made significant contributions to our criminal justice system, encompassing fields such as criminology, law enforcement, corrections, and legal jurisprudence. The book offers readers a detailed exploration of the lives, careers, and legacies of a diverse range of figures from various eras, backgrounds, and professions, all of whom have shaped America's approach to criminal justice. While highlighting key milestones and debates within criminal justice history, the book also demonstrates how the personal narratives of these figures intertwine with broader social, political, and ethical contexts. With its four distinct sections focusing on theorists, law enforcement, courts/law, and corrections, the book presents biographies chronologically, from the oldest to the most recent individuals. Readers encounter an array of personalities-from reformers and radicals to practical pioneers and those who broke racial and gender barriers. Each biography includes an introductory overview, background information, career highlights, an analysis of contributions and controversies, and concludes with legacies, further reading suggestions, and discussion prompts. The new edition of Criminal Justice Pioneers in US History is ideal for courses in criminal justice, American history, and sociology.