 as ship's doctor on H.M.S.Porlock Bay based in Bermuda, he completed his basic medical postgraduate training at Addenbrooke's Hospital, Cambridge, before selecting neuropsychiatry for a speciality.Two weeks into his first psychiatric residency at St. George's Hospital, London (20), noting the close chemical relation between the psychotomimetic drug mescaline and the neurotransmitter catecholamines, he suggested that schizophrenia might be caused by some abnormality in catecholamine metabolism that produced a mescaline-like substance in the brain.