- 1897 – Charlotte Wolff, German-English physician and psychotherapist (d. 1986).
- 1911 – Gustave Gilbert, American psychologist (d. 1977).
Charlotte Wolff (30 September 1897 to 12 September 1986) was a German-British physician who worked as a psychotherapist and wrote on sexology and hand analysis. Her writings on lesbianism and bisexuality were influential early works in the field.
Gustave Mark Gilbert (30 September 1911 to 06 February 1977) was an American psychologist best known for his writings containing observations of high-ranking Nazi leaders during the Nuremberg trials. His 1950 book The Psychology of Dictatorship was an attempt to profile the Nazi German dictator Adolf Hitler using as reference the testimonials of Hitler’s closest generals and commanders. Gilbert’s published work is still a subject of study in many universities and colleges, especially in the field of psychology.