The Harvard Psilocybin Project was a group of psychological experiments that were conducted by Richard Alpert and Timothy Leary. There were a number of graduate students working on the projects as well. The project was focused on the research and advocacy of psychedelic drugs, specifically psilocybin, which is a psychedelic compound found in certain types of mushrooms. One of the hallmark experiments was the administration of psilocybin compounds to inmates in the Concord Prison Experiment in an effort to reduce rates of recidivism. Another key experiment was the Marsh Chapel Experiment, which administered psilocybin in an effort to produce religious effects. The project ended in 1962 when a number of Harvard professors voiced concerns related to the legitimacy of the experiments being conducted.