This Doctor Robert was almost certainly German-born Dr. Robert Freymann, a 60 y-o German born physician with a practice on East 78th Street (the Dr. Charles Roberts cited in other places you may have read didn't exist. This was an alias used by Jean Stein to conceal the identity of another speed doctor.) "I can tell you in ten minutes", he said "probably 100 famous names who come here." John Lennon, the author of this song, was one of these famous names. He died in 1987.
This Doctor Robert was almost certainly German-born Dr. Robert Freymann, a 60 y-o German born physician with a practice on East 78th Street (the Dr. Charles Roberts cited in other places you may have read didn't exist. This was an alias used by Jean Stein to conceal the identity of another speed doctor.) "I can tell you in ten minutes", he said "probably 100 famous names who come here." John Lennon, the author of this song, was one of these famous names. He died in 1987.