Conversation so far:
What influenced Emil Kraepelin to get into psychiatry?
Emil Kraepelin would be a disciple of Wilhelm Wundt and had a lifelong interest in experimental psychology based on his theories.
Did Emil Kraepelin influence the psych world much?
Emil Kraepelin's fundamental theories on the diagnosis of psychiatric disorders form the basis of the major diagnostic systems in use today.

Question: How did he influence the worlds way of thinking?
Self-contained rewrite: How did Emil Kraepelin influence the psychology world's way of thinking?