Os Guinness is an author and social critic. Great-great-great grandson of Arthur Guinness, the Dublin brewer, he was born in China in World War Two where his parents were medical missionaries. A witness to the climax of the Chinese revolution in 1949, he was expelled with many other foreigners in 1951 and returned to Europe where he was educated in England.
He completed his undergraduate degree at the University of London and his DPhil in the social sciences from Oriel College, Oxford. Os has written or edited more than thirty books, including The Call, Time for Truth, Unspeakable, A Free People’s Suicide, and The Global Public Square. His latest book, Last Call for Liberty: How America’s Genius for Freedom Has Become Its Greatest Threat, was published in 2018.
Since moving to the United States in 1984, Os has been a guest scholar at the Woodrow Wilson Center for International Studies, a guest scholar and visiting fellow at the Brookings Institution, and Senior Fellow at the Trinity Forum and the EastWest Institute in New York. He was the lead drafter of the Williamsburg Charter in 1988, a celebration of the bicentennial of the US Constitution, and later of “The Global Charter of Conscience,” which was published at the European Union Parliament in 2012. Os has spoken at many of the world’s major universities, and spoken widely to political and business conferences across the world. He lives with his wife, Jenny, in the Washington, DC, area.
When former skeptic and seventeen-year-old Ravi Zacharias heard the words of Jesus in John 14:19, “Because I live, you also will live,” the trajectory of his life changed forever. In a time of helplessness and unbelief—when he was on a bed of suicide—the truth of Scripture brought hope to Zacharias, and he committed his life to Christ, promising, “I will leave no stone unturned in my pursuit of truth.” Earlier in John 14, Jesus says, “I am the way, and the truth, and the life.” This verse has become the cornerstone of Zacharias’s ultimate mission as a Christian apologist and evangelist: to present and defend the truth of Jesus Christ that others may find life in Him.
Zacharias’s calling to preach was first confirmed when he was awarded the Asian Youth Preacher Award at the international Youth Congress in Hyderabad at the age of nineteen. Years later, the Billy Graham Evangelistic Association invited Zacharias to be a plenary speaker at the inaugural International Conference for Itinerant Evangelists (“Amsterdam ‘83”) to address a gathering of 4,000 other speakers. It would be another turning point for him, as he began to seriously consider the critical need of apologetics to remove the intellectual and existential barriers that kept many skeptics from considering the truth claims of Christ. A year later, in 1984, he founded Ravi Zacharias International Ministries (RZIM).
At age 73 he remains committed to his calling to represent the gospel of Jesus Christ through historical, philosophical, and moral foundations and to defend it against objectors with grace, clarity, and coherency. He has laid the framework of the truth of the gospel to millions of people in more than 70 countries, including on the campuses of some of the world’s leading universities.
Zacharias has spent the past 48 years commending the Christian faith and addressing life’s great existential questions of origin, meaning, morality, and destiny with eloquence and grace. He fully believes the truth of Jesus Christ can endure the toughest critiques and philosophical attacks. He has authored or edited over 25 books in the fields of theology, apologetics, comparative religion, and philosophy. Zacharias and his wife, Margie, have been married for 46 years and have three grown children. They reside in Atlanta.
Sam Allberry is a global speaker for Ravi Zacharias International Ministries. He is the author of a numerous books, including Why Bother With Church?, James For You, the bestselling Is God Anti-Gay? and most recently 7 Myths About Singleness.
Sam studied theology at Wycliffe Hall in Oxford, before going on to work at St. Ebbe’s Church in Oxford where he oversaw the ministry to university students. He then worked at St. Mary’s Church in Maidenhead for several years. He is an ordained minister in the Church of England and has served on its governing body, the General Synod. Sam is a consulting editor for The Gospel Coalition.
Sam speaks widely on issues of sexuality and identity and continues to minister as a Bible teacher and pastor. In his spare time Sam enjoys hiking, American history, and slowly perfecting his recipe for Thai green curry.
John Lennox is Professor of Mathematics (emeritus) at the University of Oxford and Emeritus Fellow in mathematics and the philosophy of science. He is also an adjunct lecturer at the Oxford Centre for Christian Apologetics, as well as being an associate fellow of the Said Business School, Oxford University, where he teaches for the Oxford Strategic Leadership Programme.
Prof. Lennox studied at the Royal School Armagh, Northern Ireland, and went on to Cambridge University from which he took his MA, MMath, and PhD. He worked for many years in the Mathematics Institute at the University of Wales in Cardiff, which awarded him a DSc for his research. He also holds a DPhil from Oxford University (by incorporation) and an MA in bioethics from the University of Surrey.
In addition to over seventy published mathematical papers, he is the co-author of two research level texts in algebra in the Oxford Mathematical Monographs series. He is interested in the interface between science, philosophy, and theology and his books on those topics include God’s Undertaker: Has Science Buried God?, Gunning for God, God and Stephen Hawking, and (his most recent) Can Science Explain Everything? Prof. Lennox has lectured extensively in North America and Eastern and Western Europe on mathematics, the philosophy of science, and the intellectual defense of Christianity. He has also debated a number of prominent atheists, including Richard Dawkins, Christopher Hitchens, and Peter Singer. (Website: www.johnlennox.org)
Dr. Amy Orr-Ewing is a senior vice president with Ravi Zacharias International Ministries and Joint Director of the Oxford Centre for Christian Apologetics. She leads a team of pioneering apologist-evangelists and speaks around the world on how the Christian faith answers the deepest questions of life.
Over the last twenty years, Amy has spoken on university campuses including Oxford, Cambridge, Vienna, Hong Kong, Phoenix, and Massachusetts, in the Speakers Rooms and Chapel at the UK Parliament, on Capitol Hill, and to West Wing staff at the White House. She also speaks in banks, businesses, and consultancy firms as well as churches and conferences.
Amy gained a first-class degree in theology and a DPhil (doctorate) from the University of Oxford. She is also the co-founder of REBOOT, a youth apologetics initiative aimed at helping young people think deeply about faith, which now runs in countries all over the world. Amy is married to Frog and helps lead Latimer Minster, a church plant and community on a farm in Buckinghamshire, and they have three children.