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Paulino Iglesias Posse (October 18, 1850 – December 9, 1925), better known as Pablo Iglesias, was a Spanish socialist and labour leader. He is regarded as the father of Spanish socialism; having founded the Spanish Socialist Workers' Party (PSOE) in 1879 and the Spanish General Workers' Union (UGT) in 1888.

Iglesias was born to humble parents who called him Paulino. He attended school between the ages of six and nine, when his father, a municipal laborer, died. Pablo, his younger brother, and their mother put their possessions in a small covered cart and walked with it to live in Madrid. Pablo's mother survived there by begging, and both boys entered the Hospicio of San Fernando. They completed primary schooling there, and Pablo learned printing. Aged twelve he left the Hospicio to work and to help support his mother. He worked as a printer, gradually improving his wages. While he was rendered unemployed by a strike, his brother died of tuberculosis.

He attended evening classes and learned French. This let him read classic works of French political science, translate the works of French socialists and participate successfully in international congresses. Protected by the 1869 Constitution, the Spanish section of the International Workers Association (AIT) organized a series of conferences in Madrid. Iglesias attended, and in 1870, was invited to enter the printers section. The appearance of Solidarity, newspaper of the International, started him on the intense journalistic career that occupied the rest of his life.

Frederick Antony Ravi Kumar Zacharias (born 1946) is an Indian-born, Canadian-American evangelical Christian apologist. Zacharias is the author of numerous Christian books, including Gold Medallion Book Award winner Can Man Live Without God? and bestsellers Light in the Shadow of Jihad and The Grand Weaver. He is the founder and chairman of the board of Ravi Zacharias International Ministries, host of the radio programs Let My People Think and Just Thinking, and visiting professor at Wycliffe Hall of Oxford, where he teaches apologetics and evangelism. Zacharias studied as a visiting scholar at Cambridge University and held the chair in Evangelism and Contemporary Thought at Alliance Theological Seminary from 1981 to 1984. Commentator Chuck Colson referred to Zacharias as "the great apologist of our time."

Zacharias was born in Madras, India. Zacharias claims descent from a woman (of the Nambudiri Brahmin caste) and a low caste Boatman. Missionaries spoke to one of his ancestors about Christianity and thereafter the family was converted. Zacharias grew up in a nominal Anglican household, and he himself was an atheist until the age of 17, when he unsuccessfully tried to commit suicide by swallowing poison. While in the hospital, a local Christian worker brought him a Bible and instructed his mother to read to him out of John 14. Zacharias says that it was John 14:19 that touched him and caused him to commit his life to Christ.

Harvey Friedman (born 23 September 1948) is a mathematical logician at Ohio State University in Columbus, Ohio. He is noted especially for his work on reverse mathematics, a project intended to derive the axioms of mathematics from the theorems considered to be necessary. In recent years this has advanced to a study of Boolean relation theory, which attempts to justify large cardinal axioms by demonstrating their necessity for deriving certain propositions considered "concrete".

Friedman earned his Ph.D. from the Massachusetts Institute of Technology in 1967, with a dissertation on Subsystems of Analysis. His advisor was Gerald Sacks. Friedman received the Alan T. Waterman Award in 1984. He delivered the Tarski lectures in 2007.

In 1967, Friedman was listed in the Guinness Book of World Records for being the world's youngest professor when he taught at Stanford University at age 18 as an assistant professor of philosophy. He has also been a professor of mathematics and a professor of music.

Thomas Paine (January 29, 1737 (NS February 9, 1737) – June 8, 1809) was an English-American author, pamphleteer, radical, inventor, intellectual, revolutionary, and one of the Founding Fathers of the United States. He has been called "a corsetmaker by trade, a journalist by profession, and a propagandist by inclination."

Born in Thetford, England, in the county of Norfolk, Paine immigrated to the British American colonies in 1774 in time to participate in the American Revolution. His principal contributions were the powerful, widely read pamphlet Common Sense (1776), the all-time best-selling American book that advocated colonial America's independence from the Kingdom of Great Britain, and The American Crisis (1776–83), a pro-revolutionary pamphlet series. Common Sense was so influential that John Adams said, "Without the pen of the author of Common Sense, the sword of Washington would have been raised in vain.”

Paine lived in France for most of the 1790s, becoming deeply involved in the French Revolution. He wrote the Rights of Man (1791), in part a defense of the French Revolution against its critics. His attacks on British writer Edmund Burke led to a trial and conviction in absentia in 1792 for the crime of seditious libel. In 1792, despite not speaking French, he was elected to the French National Convention. The Girondists regarded him as an ally. Consequently, the Montagnards, especially Robespierre, regarded him as an enemy. In December of 1793, he was arrested and imprisoned in Paris, then released in 1794. He became notorious because of The Age of Reason (1793–94), his book that advocates deism, promotes reason and freethinking, and argues against institutionalized religion in general and Christian doctrine in particular. He also wrote the pamphlet Agrarian Justice (1795), discussing the origins of property, and introduced the concept of a guaranteed minimum income.