What dr Seuss do after college?

Dr. Seuss, whose real name was Theodor Seuss Geisel, did not go to college. He dropped out of Dartmouth College and then went on to Oxford University, but did not graduate from there either. After leaving Oxford, he began his career as a cartoonist and illustrator.

So, to answer your question directly, Dr. Seuss didn't do anything *after* college because he didn't finish it! He did, however, go on to have a tremendously successful career as a writer and illustrator, creating some of the most beloved children's books of all time.