Conversation so far:
What type of medicine was Havelock Ellis involved in?
Havelock Ellis returned to England in April 1879. He had decided to take up the study of sex and felt his first step must be to qualify as a physician.
What type of physcician was Havelock Ellis?
Was Havelock Ellis homosexual?

Question: what does he do on the medicine side?
Self-contained rewrite: What does Havelock Ellis do on the medicine side?