This book explores probation staff understandings of professionalism in the aftermath of the Transforming Rehabilitation (TR) reforms to services in England and Wales. Drawing on the sociology of the professions, this book offers an original and timely contribution to the criminal justice literature, examining the ways in which professionalism in probation has been reshaped and renegotiated in response to the market logic that has dominated public services in recent decades. The case of the TR reforms offers a useful platform for exploring broader shifts in understandings of professionalism. This book demonstrates the ways in which professionalism in probation can be understood as a discourse through which professionals are expected to be receptive to the demands of multiple stakeholders – offenders, taxpayers, the state, and, additionally, the market. It situates TR in a marketising continuum, the logical endpoint of a period of reform that has sought to discipline staff and reshape their understandings of professionalism. Written in a clear and direct style, this book is essential reading for researchers engaged in probation, rehabilitation, criminal justice, and organizational and professional studies.