Thomas Aquinas, O.P. ( /əˈkwaɪnəs/ ə-KWY-nəs; 1225 – 7 March 1274), also Thomas of Aquin or Aquino, was an Italian Dominican priest of the Roman Catholic Church, and an immensely influential philosopher and theologian in the tradition of scholasticism, known as Doctor Angelicus ([the] Angelic Doctor), Doctor Communis, or Doctor Universalis. "Aquinas" is not a surname, but is a Latin demonym for a resident of Aquino, his place of birth. He was the foremost classical proponent of natural theology, and the father of Thomism. His influence on Western thought is considerable, and much of modern philosophy was conceived as a reaction against, or as an agreement with, his ideas, particularly in the areas of ethics, natural law, metaphysics, and political theory.

Thomas is held in the Catholic Church to be the model teacher for those studying for the priesthood. The works for which he is best-known are the Summa Theologica and the Summa Contra Gentiles. As one of the 33 Doctors of the Church, he is considered the Church's greatest theologian and philosopher. Pope Benedict XV declared: "This (Dominican) Order ... acquired new luster when the Church declared the teaching of Thomas to be her own and that Doctor, honored with the special praises of the Pontiffs, the master and patron of Catholic schools."

Jürgen Habermas ( /ˈjɜrɡən/ or /ˈjʊərɡən ˈhɑːbərmɑːs/;German: [ˈjʏʁɡən ˈhaːbɐmaːs]; born June 18, 1929) is a German sociologist, geographer and philosopher in the tradition of critical theory and pragmatism. He is perhaps best known for his theory on the concepts of 'communicative rationality' and the 'public sphere'. His work focuses on the foundations of social theory and epistemology, the analysis of advanced capitalistic societies and democracy, the rule of law in a critical social-evolutionary context, and contemporary politics, particularly German politics. Habermas's theoretical system is devoted to revealing the possibility of reason, emancipation, and rational-critical communication latent in modern institutions and in the human capacity to deliberate and pursue rational interests. Habermas is known for his work on the concept of modernity, particularly with respect to the discussions of "rationalization" originally set forth by Max Weber. While influenced by American pragmatism, action theory, and even poststructuralism, many of the central tenets of Habermas' thought remain broadly Marxist in nature. Global polls identified him as one of the leading intellectuals of the present day.

John Locke FRS ( /ˈlɒk/; 29 August 1632 – 28 October 1704), widely known as the Father of Classical Liberalism, was an English philosopher and physician regarded as one of the most influential of Enlightenment thinkers. Considered one of the first of the British empiricists, following the tradition of Francis Bacon, he is equally important to social contract theory. His work had a great impact upon the development of epistemology and political philosophy. His writings influenced Voltaire and Rousseau, many Scottish Enlightenment thinkers, as well as the American revolutionaries. His contributions to classical republicanism and liberal theory are reflected in the United States Declaration of Independence.

Locke's theory of mind is often cited as the origin of modern conceptions of identity and the self, figuring prominently in the work of later philosophers such as Hume, Rousseau and Kant. Locke was the first to define the self through a continuity of consciousness. He postulated that the mind was a blank slate or tabula rasa. Contrary to pre-existing Cartesian philosophy, he maintained that we are born without innate ideas, and that knowledge is instead determined only by experience derived from sense perception.

Glenn Edward Lee Beck (born February 10, 1964) is an American conservative radio host, vlogger, author, entrepreneur, political commentator and former television host. He hosts the Glenn Beck Program, a nationally syndicated talk-radio show that airs throughout the United States on Premiere Radio Networks. He formerly hosted the Glenn Beck television program, which ran from January 2006 to October 2008 on HLN and from January 2009 to June 2011 on the Fox News Channel. Beck has authored six New York Times–bestselling books. Beck is the founder and CEO of Mercury Radio Arts, a multimedia production company through which he produces content for radio, television, publishing, the stage, and the Internet. It was announced on April 6, 2011, that Beck would "transition off of his daily program" on Fox News later in the year but would team with Fox to "produce a slate of projects for FOX News Channel and FOX News' digital properties". Beck's last daily show on the network was June 30, 2011. In 2012, The Hollywood Reporter named Beck on its Digital Power Fifty list.

Cass Robert Sunstein (born September 21, 1954) is an American legal scholar, particularly in the fields of constitutional law, administrative law, environmental law, and law and behavioral economics, who currently is the Administrator of the White House Office of Information and Regulatory Affairs in the Obama administration. For 27 years, Sunstein taught at the University of Chicago Law School, where he continues to teach as the Harry Kalven Visiting Professor. Sunstein is currently Professor of Law at Harvard Law School, where he is on leave while working in the Obama administration.

Sunstein was born on September 21, 1954 in Concord, Massachusetts, the son of Marian (née Goodrich), a teacher, and Cass Richard Sunstein, a builder. His family was Jewish. He graduated in 1972 from the Middlesex School in Concord, Massachusetts. He earned an A.B. in 1975 from Harvard College, where he was a member of the varsity squash team and the Harvard Lampoon. In 1978, Sunstein received a J.D. magna cum laude from Harvard Law School, where he was executive editor of the Harvard Civil Rights-Civil Liberties Law Review and part of a winning team of the Ames Moot Court Competition. He served as a law clerk first for Justice Benjamin Kaplan of the Massachusetts Supreme Judicial Court (1978–1979) and later for Justice Thurgood Marshall of the United States Supreme Court (1979–1980).