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circa 1865: Studio portrait of Austrian psychoanalyst Dr. Sigmund Freud (1856 - 1939) as a child, standing next to his father. (Photo by Hulton Archive/Getty Images)

circa 1865:  Studio portrait of Austrian psychoanalyst Dr. Sigmund Freud (1856 - 1939) as a child, standing next to his father.  (Photo by Hulton Archive/Getty Images)

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1885: Studio portrait of Austrian psychoanalyst Sigmund Freud (1856 - 1939) and his fiancee, Martha Bernays, during their engagement. (Photo by Hulton Archive/Getty Images)

1885:  Studio portrait of Austrian psychoanalyst Sigmund Freud (1856 - 1939) and his fiancee, Martha Bernays, during their engagement.  (Photo by Hulton Archive/Getty Images)

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circa 1905: Interior view of the study of Austrian psychoanalyst Sigmund Freud, Vienna, Austria. Most of the furniture and antiquities he brought with him to London in 1938. (Photo by Hulton Archive/Getty Images)

circa 1905:  Interior view of the study of Austrian psychoanalyst Sigmund Freud, Vienna, Austria. Most of the furniture and antiquities he brought with him to London in 1938.  (Photo by Hulton Archive/Getty Images)

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Austrian psychoanalyst Dr. Sigmund Freud (1856 - 1939) walks outdoors with his daughter Anna while on a trip in the Dolomite mountain range, 1912. (Photo by Hulton Archive/Getty Images)

Austrian psychoanalyst Dr. Sigmund Freud (1856 - 1939) walks outdoors with his daughter Anna while on a trip in the Dolomite mountain range, 1912. (Photo by Hulton Archive/Getty Images)

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5th June 1938, Paris, France, Professor Sigmund Freud the 82 year-old Austrian Psychoanalyst is pictured in Paris (Photo by Popperfoto/Getty Images)

5th June 1938, Paris, France, Professor Sigmund Freud the 82 year-old Austrian Psychoanalyst is pictured in Paris  (Photo by Popperfoto/Getty Images)