Sigmund Freud

Sigmund Freud was a psychologist in the 20th century. The Eighth Doctor visited Freud while he was suffering from amnesia to jog his memory. (EDA: The City of the Dead) Freud wrote a book called The Interpretation of Dreams. (ST: Evergreen) The Doctor once taught a form of hypnotism to Sigmund Freud. (BFA: The Girl Who Never Was)