In 1914, Frank Tannenbaum, then in his early twenties, was sentenced to a year’s stay on New York’s Blackwell Island, the site of a notorious penitentiary. Tannenbaum was sentenced to prison for his labor organizing activities. In short order, Tannenbaum, who frequently hung out at Emma Goldman’s Mother Earth offices, came into the company of such prison reformers as Thomas Mott Osbourne, E. Franklin Stagg, and Harry Elmer Barnes. These men and others helped him enter Columbia University where he studied political science while pursuing penal reform ideas that emerged from his experience as a convict on Blackwell Island. Eventually, Tannenbaum visited over 70 prisons across the country, including in the South and West, and produced a series of landmark studies, including Wall Shadows (1922), Darker Phases of the South (1924), Osbourne of Sing Sing (1933), and Crime and the Community (1938). In this slim volume, Matt Yeager, a criminologist at King’s University College in London, Ontario, expands upon a Prison Journal article published several years ago. As Yeager deftly points out, Tannenbaum’s career as a prison reformer-criminologist was comparatively short-lived. In one of the many personal notes Yeager culled from Tannenbaum’s archival resources at Columbia’s Butler Library, Tannenbaum, whose interest in Mexico and Latin American dominated the later stages of his life, claimed that his incarceration guided his interest in prison reform. Deeply involved with his own experiences, he delved equally as deeply into prison conditions, prison discipline, prison administration, and prison reform. Heavily influenced by Thomas Mott Osbourne, Tannenbaum long adhered to the ideals of prisoner self-governance. He never felt that prisons were feasible. Mirroring other reformers of the period, Tannenbaum was not a prison abolitionist, but rather felt that prisons could be radically reorganized, leaving oppressive prison cellblocks in the past.Tannenbaum’s theoretical criminology was a slight, but significant precursor of labelling theory, later pushed by the likes of Howard Becker, Edwin Lemert and others. Instead, Tannenbaum’s strength was a straight-forward critique of the external housing and internal disciplining of prisoners. Having been one of them, he saw convicts as human beings. Tannenbaum was an early exemplar, and maybe the first, of "convict criminology," the contemporary (organized) emergence of a school of criminologists who generally started their criminological careers while incarcerated as juveniles or adults. Yeager’s history of Tannenbaum’s political activism, penal reform, and public intellectualism is well-suited for current discussions of prison reform, especially in this era of mass incarceration. Plus, Yeager’s discoveries in the Columbia archives make for some exciting reading. In reminding us of Tannenbaum’s legacy, he has done good service.-- Russ Immarigeon, International Community Corrections Association Journal