Conversation so far:
What did Robert Crumb do in 1962?
Robert Crumb's father gave him $40 when he left home after high school.
What did Robert Crumb do when he left home after high school?
Robert Crumb's first job, in 1962, was drawing novelty greeting cards for American Greetings in Cleveland, Ohio.
How long did Robert Crumb draw novelty greeting cards for American Greetings?
Robert Crumb stayed with the American Greetings company for four years.
What did Robert Crumb do after working for American Greetings for four years?
Dissatisfied with greeting card work, Robert Crumb tried to sell cartoons to comic book companies.
Was Robert Crumb successful in trying to sell cartoons to comic book companies?
Comic book companies showed little interest in Robert Crumb's work.
Did people like the cartoons Robert Crumb tried to sell to comic book companies?
Did Robert Crumb do anything else besides everything mentioned previously?
Robert Crumb married Dana Morgan in 1964.
Did Robert Crumb and Dana Morgan have any children?
The relationship was unstable as Robert Crumb frequently went his own way, and he was not close to his son Jesse, who was born in 1965.

Question: Did he do any other work?
Self-contained rewrite: Did Robert Crumb do any other work after leaving American Greetings?