I had learned of Gertrude Stein's bon mot that medicine opened all doors. This prompted me, in different moods, to view my future life as literary psychiatrist, globe-trotting tropical disease specialist, or academic internist.
In preparation for a career in academic medicine, I worked as a medical house officer at Columbia-Presbyterian Hospital from 1966 to 1968 and then joined Ira Pastan's laboratory at the National Institutes of Health as a Clinical Associate.