Carl Ransom Rogers was an American psychologist who was one of the founders of humanistic psychology and was known especially for his person-centered psychotherapy. Rogers is widely considered one of the founding fathers of psychotherapy research and was honored for his pioneering research with the Award for Distinguished Scientific Contributions by the American Psychological Association (APA) in 1956.
Carl Edward Sagan was an American astronomer, planetary scientist, cosmologist, astrophysicist, astrobiologist, science communicator, author, and professor. His best known scientific contribution is his research on the possibility of extraterrestrial life, including experimental demonstration of the production of amino acids from basic chemicals by radiation. He assembled the first physical messages sent into space, the Pioneer plaque and the Voyager Golden Record, which were universal messages that could potentially be understood by any extraterrestrial intelligence that might find them. He argued in favor of the hypothesis, which has since been accepted, that the high surface temperatures of Venus are the result of the greenhouse effect.
Carl Hermann Salemann was a Russian Iranist scholar. He was an academician of Saint Petersburg Academy of Sciences (1895) and a director of Asiatic Museum of the Academy of Sciences (1890—1916).
Carl August Sandburg was an American poet, biographer, journalist, and editor. He won three Pulitzer Prizes: two for his poetry and one for his biography of Abraham Lincoln. During his lifetime, Sandburg was widely regarded as "a major figure in contemporary literature", especially for volumes of his collected verse, including Chicago Poems (1916), Cornhuskers (1918), and Smoke and Steel (1920). He enjoyed "unrivaled appeal as a poet in his day, perhaps because the breadth of his experiences connected him with so many strands of American life". When he died in 1967, President Lyndon B. Johnson observed that "Carl Sandburg was more than the voice of America, more than the poet of its strength and genius. He was America."
Carl Lynwood Sargent was a British parapsychologist and author of several roleplaying game-based products and novels, who used the pen name Keith Martin to write Fighting Fantasy gamebooks.
Carl Schmitt was a German jurist, political theorist, and prominent member of the Nazi Party. Schmitt wrote extensively about the effective wielding of political power. A conservative theorist, he is noted as a critic of parliamentary democracy, liberalism, and cosmopolitanism. His work has been a major influence on subsequent political theory, legal theory, continental philosophy, and political theology, but its value and significance are controversial, mainly due to his intellectual support for and active involvement with Nazism. Schmitt's work has attracted the attention of numerous philosophers and political theorists, including Giorgio Agamben, Hannah Arendt, Walter Benjamin, Susan Buck-Morss, Jacques Derrida, Waldemar Gurian, Carlo Galli, Jaime Guzmán, Jürgen Habermas, Friedrich Hayek, Reinhart Koselleck, Chantal Mouffe, Antonio Negri, Leo Strauss, Adrian Vermeule, and Slavoj Žižek, among others.
Carl Schurz was a German revolutionary and an American statesman, journalist, and reformer. He migrated to the United States after the German revolutions of 1848–1849 and became a prominent member of the new Republican Party. After serving as a Union general in the American Civil War, he helped found the short-lived Liberal Republican Party and became a prominent advocate of civil service reform. Schurz represented Missouri in the United States Senate and was the 13th United States Secretary of the Interior.
