Mortimer Jerome Adler (December 28, 1902 – June 28, 2001) was an American philosopher, educator, and popular author. As a philosopher he worked within the Aristotelian and Thomistic traditions. He lived for the longest stretches in New York City, Chicago, San Francisco, and San Mateo, California. He worked for Columbia University, the University of Chicago, Encyclopædia Britannica, and Adler's own Institute for Philosophical Research.

Adler was born in New York City on December 28, 1902, to Jewish immigrants. He dropped out of school at age 14 to become a copy boy for the New York Sun, with the ultimate aspiration to become a journalist. Adler soon returned to school to take writing classes at night where he discovered the works of men he would come to call heroes: Aristotle, Thomas Aquinas, John Locke, John Stuart Mill and others. He went on to study at Columbia University and contributed to the student literary magazine, The Morningside, (a poem "Choice" in 1922 when Charles A. Wagner was editor-in-chief and Whittaker Chambers an associate editor). Though he failed to pass the required swimming test for a bachelor's degree (a matter that was rectified when Columbia gave him an honorary degree in 1983), he stayed at the university and eventually received an instructorship and finally a doctorate in psychology. While at Columbia University, Adler wrote his first book: Dialectic, published in 1927.

Charles Lincoln Van Doren (born February 12, 1926) is an American intellectual, writer, and editor who was involved in a television quiz show scandal in the 1950s. In 1959 he confessed before the United States Congress that he had been given the correct answers by the producers of the show Twenty One.

The son of Pulitzer Prize-winning poet and literary critic/teacher Mark Van Doren and novelist and writer Dorothy Van Doren, and nephew of critic and Pulitzer Prize-winning biographer Carl Van Doren, Charles Van Doren was a committed academic with an unusually broad range of interests. He graduated from The High School of Music & Art and then earned a B.A. degree in Liberal Arts (1946) from St. John's College in Annapolis, Maryland, as well as a master's degree in astrophysics (1949) and a doctorate in English (1955), both at Columbia University. He was also a student at Cambridge University in England.

Twenty One was not Van Doren's first interest. He was long believed to have approached producers Dan Enright and Albert Freedman, originally, to appear on Tic-Tac-Dough, another game they produced. Van Doren eventually revealed—five decades after his Twenty One championship and fame, in a surprise article for The New Yorker—that he did not even own a television set, but had met Freedman through a mutual friend, with Freedman initiating the idea of Van Doren going on television by way of asking what he thought of Tic-Tac-Dough.

William Frank Buckley, Jr. (November 24, 1925 – February 27, 2008) was an American conservative author and commentator. He founded the political magazine National Review in 1955, which had a major impact in stimulating the conservative movement. He hosted 1,429 episodes of the television show Firing Line from 1966 until 1999, where his public persona was famous for a sesquipedalian vocabulary. He also wrote a nationally syndicated newspaper column, and wrote numerous spy novels.

George H. Nash, a historian of the modern American conservative movement, states that Buckley was "arguably the most important public intellectual in the United States in the past half century... For an entire generation, he was the preeminent voice of American conservatism and its first great ecumenical figure." Buckley's primary contribution to politics was a fusion of traditional American political conservatism with laissez-faire economic theory and anti-communism, laying groundwork for the new American conservatism of U.S. presidential candidate Barry Goldwater and President Ronald Reagan.

Aaron Copland ( /ˌærən ˈkoʊplənd/; November 14, 1900 – December 2, 1990) was an American composer, composition teacher, writer, and later in his career a conductor of his own and other American music. He was instrumental in forging a distinctly American style of composition, and is often referred to as "the Dean of American Composers". He is best known to the public for the works he wrote in the 1930s and 1940s in a deliberately more accessible style than his earlier pieces, including the ballets Appalachian Spring, Billy the Kid, Rodeo and his Fanfare for the Common Man. The open, slowly changing harmonies of many of his works are archetypical of what many people consider to be the sound of American music, evoking the vast American landscape and pioneer spirit. However, he wrote music in different styles at different periods of his life: his early works incorporated jazz or avant-garde elements whereas his later music incorporated serial techniques. In addition to his ballets and orchestral works, he produced music in many other genres including chamber music, vocal works, opera and film scores.