Founder of modern socialist thought.

Influential Swiss Reformed theologian, Christocentric.

Philosopher of science, falsifiability proponent.

Philosopher known for existentialism theory.

(born Károly Manheim, 27 March 1893 – 9 January 1947) a Hungarian sociologist and a key figure in classical sociology as well as one of the founders of the sociology of knowledge.

Statistician, founder of mathematical statistics.

Karl Kraus (28 April 1874 – 12 June 1936)Encyclopaedia Britannica was an Austrian writer and journalist, known as a satirist, essayist, aphorist, playwright and poet.

Karl Johann Kautsky (16 October 1854 – 17 October 1938) was a Czech-Austrian philosopher, journalist, and Marxist theorist.

German socialist, anti-war activist.

Republican strategist, George W. Bush.

Pioneering American psychiatrist and author.

(3 May 1877 – 25 December 1925) an influential German psychoanalyst, and a collaborator of Sigmund Freud, who called him his 'best pupil'.

(born 14 November 1938) an Austrian architect.

Karl Jay Shapiro (November 10, 1913 – May 14, 2000) was an American poet.