Well i think they fit together just fine. I don't study psychology, and the father of it would be freud i would assume. Despite the fact many of his theories are disproven.
His theories were the starting point that lead to many other more likely ones. Freud is largely a joke to the majority of those who follow Psychology. Merely a stepping stone for the birth of many other theories that are far easier to swallow, not much more.
You know his "Your Mom" jokes would have been legendary if the fad were around in his lifetime.