Freud

Freud's studies still matter today because he started the foundation of psychology. For example, he started the whole idea of talking about your problems to feel better; something we use frequently still today. He was correct that humans are naturally going to destroy themselves and that the dark side of the subconscious mind definitely exists. If he were alive today he would likely warn us that more wars will break out because of non-peaceful ties in Israel and other countries not getting along. He might also comment on the fact that sexuality is a lot more talked about and open today and why that is, since he spent a lot of time talking to his patients about their lusts.