Freud's increasing coolness toward her and her concern over the rise of Nazism in Germany motivated her to accept an invitation by Franz Alexander to become his assistant at the Chicago Institute of Psychoanalysis, and in 1932, she and her daughters moved to the United States.Two years after moving to Chicago, Horney relocated to Brooklyn.She had a sexual relationship with Fromm that ended bitterly.

born Danielsen, 16 September 1885 – 4 December 1952) was a German psychoanalyst who practiced in the United States during her later career.

Her theories questioned some traditional Freudian views.

She felt that she could not become pretty, and instead decided to vest her energies into her intellectual qualities — despite the fact she was seen by most as pretty.

At this time she developed a crush on her older brother, who became embarrassed by her attentions — soon pushing her away.

It was also in 1923 that Karen's brother died of a pulmonary infection.

Both these events contributed to a worsening of Karen's mental health.

Karen and her three daughters moved out of Oskar's house.

Despite her increasing deviation from orthodox Freudian doctrine, she practiced and taught at the Berlin Psychoanalytic Society until 1932.

Through her fellow student Carl Müller-Braunschweig - who later became a psychoanalyst - she met the business student Oskar Horney. The couple moved to Berlin together, where Oskar worked in industry while Karen continued her studies at Charité.