Alvin Carl Plantinga (born November 15, 1932) is an American analytic philosopher, the emeritus John A. O'Brien Professor of Philosophy at the University of Notre Dame and the inaugural holder of the Jellema Chair in Philosophy at Calvin College.

He is known for his work in philosophy of religion, epistemology, metaphysics and Christian apologetics. Plantinga is the author of a number of books including God and Other Minds (1967), The Nature of Necessity (1974), and the "warrant" series culminating in Warranted Christian Belief (2000). He has delivered the Gifford Lectures three times, and was described by Time magazine as "America's leading orthodox Protestant philosopher of God".

Plantinga was born on November 15, 1932 in Ann Arbor, Michigan to Cornelius A. Plantinga (1908–1994) and Lettie G. Bossenbroek (1908–2007). Plantinga's father was a first generation immigrant, born in the Netherlands. His family is from the Dutch province of Friesland. Plantinga’s father earned a Ph.D. in philosophy from Duke University and a Master's Degree in psychology, and taught several academic subjects at different colleges over the years. One of Plantinga's brothers, Cornelius "Neal" Plantinga, Jr., is a theologian and the former president of Calvin Theological Seminary. Another of his brothers, Leon, is an emeritus professor of musicology at Yale University. His brother Terrell worked for CBS News.

William Lane Craig (born August 23, 1949) is an American analytic philosopher, philosophical theologian, and Christian apologist. He is known for his work in the philosophy of religion, philosophy of time, and the defense of Christian theism. One of his most notable contributions to the philosophy of religion is his defense of the Kalām cosmological argument, which is the most widely discussed argument for the existence of God in contemporary Western philosophy. In theology, he has also defended Molinism and the belief that God is, since Creation, subject to time.

Craig has authored or edited over 30 books, including The Kalām Cosmological Argument (1979), The Cosmological Argument from Plato to Leibniz (1980), Theism, Atheism, and Big Bang Cosmology (with Quentin Smith, 1993), Philosophical Foundations for a Christian Worldview (with J.P. Moreland, 2003) and Reasonable Faith: Christian Truth and Apologetics (3d edition, 2008).

Craig received a Bachelor of Arts degree in communications from Wheaton College, Illinois, in 1971 and two summa cum laude master's degrees from Trinity Evangelical Divinity School in Deerfield, Illinois, in 1975, in philosophy of religion and ecclesiastical history. He earned a Ph.D. in philosophy under John Hick at the University of Birmingham, England in 1977 and a Th.D. under Wolfhart Pannenberg at the University of Munich in 1984.

William Lane (6 September 1861 – 26 August 1917) was a journalist, advocate of Australian labour politics and a utopian.

Lane was born in Bristol, England, eldest son of James Lane, from Ireland a Protestant Master Gardener, and his English wife Caroline, née Hall. When Lane was born his father was earning a miserable wage, but later his circumstances improved and he became an employer. The boy was educated at Bristol Grammar School and showed ability, but he was sent early to work as an office boy. Lane's mother died when he was 14 years of age, and at age 16 he migrated to Canada, then to the United States, where he worked first as a printer, then as a reporter for the Detroit Free Press (1881), there meeting his future wife Ann MacGuire. In 1885 they migrated to Brisbane, Australia, where Lane immediately got work as a feature writer for the weekly newspaper Queensland Figaro, then as a columnist for the newspapers Brisbane Courier and Evening Telegraph, using a number of pseudonyms ("Lucinda Sharpe", which some consider to be the work of Annie Lane, William Wilcher and "Sketcher").

Quentin Persifor Smith (born August 27, 1952 in Rhinebeck, New York) is an American contemporary philosopher, scholar and professor of philosophy at Western Michigan University in Kalamazoo, Michigan. He has worked in the philosophy of time, philosophy of language, philosophy of physics and philosophy of religion. Smith has published over 140 articles and of his published books, he has authored three, co-authored two, and co-authored and edited seven. He is an editor for Prometheus Books and was the chief editor for Philo from 2001 to 2007.

Daniel Clement Dennett (born March 28, 1942) is an American philosopher, writer and cognitive scientist whose research centers on the philosophy of mind, philosophy of science and philosophy of biology, particularly as those fields relate to evolutionary biology and cognitive science. He is currently the Co-director of the Center for Cognitive Studies, the Austin B. Fletcher Professor of Philosophy, and a University Professor at Tufts University. Dennett is a firm atheist and secularist, a member of the Secular Coalition for America advisory board, as well as an outspoken supporter of the Brights movement. Dennett is referred to as one of the "Four Horsemen of New Atheism," along with Richard Dawkins, Sam Harris, and the late Christopher Hitchens.

Born in Boston, Massachusetts, Dennett spent part of his childhood in Lebanon, where, during World War II, his father was a covert counter-intelligence agent with the Office of Strategic Services posing as a cultural attaché to the American Embassy in Beirut. When he was five, his mother took him back to Massachusetts after his father died in an unexplained plane crash. His sister is the investigative journalist Charlotte Dennett.