Karl Theodor Jaspers was a German-Swiss psychiatrist and philosopher who had a strong influence on modern theology, psychiatry, and philosophy. His 1913 work General Psychopathology influenced many later diagnostic criteria, and argued for a distinction between "primary" and "secondary" delusions.
Jaspers in 1946
Karl Jaspers in 1910
Karl Jaspers: Allgemeine Psychopathologie, first print 1913
Existentialism is a form of philosophical inquiry that explores the issue of human existence. Existentialist philosophers explore questions related to the meaning, purpose, and value of human existence. Common concepts in existentialist thought include existential crisis, dread, and anxiety in the face of an absurd world and free will, as well as authenticity, courage, and virtue.
Sisyphus, the symbol of the absurdity of existence, painting by Franz Stuck (1920)
French philosophers Jean-Paul Sartre and Simone de Beauvoir
French philosopher, novelist, and playwright Albert Camus
Adolphe Menjou (left) and Kirk Douglas (right) in Paths of Glory (1957)