Leary giving a lecture on his first book, "Interpersonal Diagnosis of Personality", circa 1950's. Timothy Francis Leary (October 22, 1920 - May 31, 1996) was an American psychologist and writer. During a time when drugs such as LSD and psilocybin were legal, Leary conducted experiments at Harvard University under the Harvard Psilocybin Project, resulting in the Concord Prison Experiment and the Marsh Chapel Experiment. Both studies produced useful data, but Leary and his associate Richard Alpert were fired from the university because of the public controversy surrounding their research. He wrote and spoke frequently about trans-humanist concepts involving space migration, intelligence increase and life extension, and developed the eight-circuit model of consciousness in his book Exo-Psychology (1977). During the 1960s and 1970s, he was arrested often enough to see the inside of 29 different prisons worldwide. He died of prostate cancer in1996 at the age of 75. Seven grams of Leary's ashes were arranged by his friend at Celestis to be buried in space aboard a rocket carrying the remains of 24 others. A Pegasus rocket containing their remains was launched on April 21, 1997, and remained in orbit for six years until it burned up in the atmosphere.