Who is Sigmund Freud and what made him revolutionary in his field of work?

A psychologist who developed the theory of psychoanalysis and the "unconscious."

Explanation:

Sigmund Freud was one of the first people to study psychology, and he theorized that every thought and action was a result of our unconscious, or memories buried deep below our conscious thinking level.  His practices (predominantly with wealthy women) were considered scandalous at the time, but nonetheless, some still consider him the founder of psychoanalysis.

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richard nixon was the 37th president of the united state and didn't serve as a vice president for any president before him