Michael Hollingshead was an early figure in the history of LSD research. Apparently he lived in Cochabamba, Bolivia for many years and according to his daughter he died there, of a stomach ulcer, in 1984. I lived in Cochabamba for many years too, but nobody ever mentioned Hollingshead to me until I got back to London in 2023 and met a niece of his who is an artist and lives somewhere in the South East of England. There was a book published by MIT Press in 2019 about him, "Divine Rascal" https://mitpress.mit.edu/9781907222788/divine-rascal/ does Terence McKenna mention him at all?