- 1939 – Adolf Hitler signs an order to begin the systematic euthanasia of mentally ill and disabled people.
- 1848 – Auguste Forel, Swiss myrmecologist, neuroanatomist, and psychiatrist (d. 1931).
- 1902 – Kazimierz Dąbrowski, Polish psychiatrist and psychologist (d. 1980).
- 1950 – Phil McGraw, American psychologist, author, and talk show host.
Auguste-Henri Forel (01 September 1848 to 27 July 1931) was a Swiss myrmecologist, neuroanatomist, psychiatrist and eugenicist, notable for his investigations into the structure of the human brain and that of ants. For example, he is considered a co-founder of the neuron theory.
Forel is also known for his early contributions to sexology and psychology. From 1978 until 2000 Forel’s image appeared on the 1000 Swiss franc banknote.
Kazimierz Dąbrowski (01 September 1902 to 26 November 1980) was a Polish psychologist, psychiatrist, and physician.
He is best known for his theory of “positive disintegration” as a mechanism in personality development. He was also a poet who used the pen name “Paul Cienin, Paweł Cienin”.
Phillip Calvin McGraw (born 01 September 1950), better known as Dr. Phil, is an American television personality, author and the host of the television show Dr. Phil. He holds a doctorate in Clinical psychology, though he ceased renewing his license to practice Psychology in 2006.
McGraw rose to fame with appearances on The Oprah Winfrey Show in the late 1990s. Oprah Winfrey then helped McGraw launch his own programme, Dr. Phil, in September 2002. The show is formatted as an advice show.