Leary's research grant after he failed to meet with a NIMH investigator. Leary and his children relocated to Europe, where he attempted to write his next book while subsisting on small grants and insurance policies. His stay in Florence was unproductive and indigent, prompting a return to academe. In late 1959 he started as a lecturer in clinical psychology at Harvard University at the behest of Frank Barron (a colleague from Berkeley) and David McClelland. Leary and his children lived in Newton, Massachusetts. In addition to teaching, Leary was affiliated with the Harvard Center for Research in Personality under McClelland. He oversaw the Harvard Psilocybin Project and conducted experiments in conjunction with assistant professor Richard Alpert. In 1963, Leary was terminated for failing to attend scheduled class lectures, though he maintained that he had met his teaching obligations. The decision to dismiss him may have been influenced by his promotion of psychedelic drug use among Harvard students and faculty. The drugs were legal at the time. His work in academic psychology expanded on the research of Harry Stack Sullivan and Karen Horney, which sought to better understand interpersonal processes to help diagnose disorders. Leary's dissertation developed the interpersonal circumplex model, later published in The Interpersonal Diagnosis of Personality. The book demonstrated how psychologists could use Minnesota Multiphasic Personality Inventory (MMPI) scores to predict how respondents might react to various interpersonal situations. Leary's research was an important harbinger of transactional analysis, directly prefiguring the popular work of Eric Berne. Psychedelic experiments and experiences Mexico and Harvard research (1957–1963) Introduction to psychedelic mushrooms On May 13, 1957, Life magazine published an article by R. Gordon Wasson about the use of psilocybin mushrooms in religious rites of the indigenous Mazatec people of Mexico. Anthony Russo, a colleague of Leary's, had experimented with psychedelic Psilocybe mexicana mushrooms on a trip to Mexico and told Leary about it. In August 1960, Leary traveled to Cuernavaca, Mexico, with Russo and consumed psilocybin mushrooms for the first time, an experience that drastically altered the course of his life. In 1965, Leary said that he had "learned more about ... [his] brain and its possibilities ... [and] more about psychology in the five hours after taking these mushrooms than ... in the preceding 15 years of studying and doing research". Back at Harvard, Leary and his associates (notably Alpert) began a research program known as the Harvard Psilocybin