Professor Koppanyi introduced him to the cholinergic field .
Upon his graduation , he was successively ( 1946 -- 1953 ) assistant and associate professor at Georgetown University , Washington , D.C. , in Theodore Koppanyi 's Department of Pharmacology and Therapeutics .
Theodore Koppanyi Theodore Koppanyi introduced him to the cholinergic field .
Upon his graduation , he was successively ( 1946 -- 1953 ) assistant and associate professor at Georgetown University , Washington , D.C. , in Theodore Koppanyi 's Department of Pharmacology and Therapeutics .