Should it be named for Ken  Kesey or Timothy Leary?  

Dr. Timothy Leary, a lecturer in psychology at Harvard University, was the most prominent pro-LSD researcher. Leary claimed that using LSD with the right dosage, set (what one brings to the experience), and setting, preferably with the guidance of professionals, could alter behavior in dramatic and beneficial ways.

At Stanford in 1959, Kesey volunteered to take part in a CIA-financed study named Project MKULTRA.  The project studied the effects on the patients of psychoactive drugs, particularly LSD, psilocybin, mescaline, cocaine, AMT, and DMT.  Kesey wrote many detailed accounts of his experiences with these drugs, both during the Project MKULTRA study and in the years of private experimentation that followed. Kesey's role as a medical guinea pig inspired him to write One Flew Over the Cuckoo's Nest in 1962. 

In the summer of 1964, Kesey's Merry Pranksters customized a bus and set out on a tour to propagate LSD use.