Craig Haney is Distinguished Professor of Psychology at the University of California, Santa Cruz. Professor Haney received his Ph.D. and J.D. degrees from Stanford University, where he served as one of the principal researchers in the well-known “Stanford Prison Experiment.” Since then he has conducted extensive, in-depth research on the psychological effects of living and working in prison environments, the nature of and deficiencies in prison mental healthcare services, and the uniquely damaging consequences of solitary confinement. In the course of this work, Haney has toured and inspected numerous prisons and solitary confinement units in the United States and throughout the world, and has interviewed hundreds of incarcerated persons about the nature and psychological impact of their experiences. The author of numerous articles and several books, including Reforming Punishment (2006) and Criminality in Context, 2020), Professor Haney has served as an expert witness in many landmark legal cases addressing the constitutional rights of prisoners, including the United States Supreme Court case, Brown v. Plata (2011). In 2012, he was appointed to a National Academy of Sciences Committee studying the causes and consequences of mass incarceration in the United States and also testified at an historic hearing before the U.S. Senate examining the nature and effects of solitary confinement.