Os Guinness is a Christian apologist and social analyst who lives in McLean, Virginia. Born in China during World War II, he remained there until 1951 when the Communists forced most foreigners to leave. Educated in England, he did undergraduate studies at the University of London and postgraduate studies at University of Oxford, where he graduated with a D.Phil in the social sciences from Oriel College.
He has written or edited more than twenty books, including The American Hour (Free Press, 1993), The Call (Word 1998), Time for Truth (Baker 2000), Long Journey Home (Doubleday 2001), and Unspeakable: Facing Up to Evil in an Age of Genocide and Terror (HarperCollins, 2005).
Guinness is the creative force behind The Trinity Forum, a Christian think tank that came about as the result of a remark by one of Guinness's mentors. "Peter Berger, one of my mentors in sociology, remarked that the United States is a nation of Indians ruled by Swedes," Guinness notes. "By that he meant that the American people are as religious as the people of India-the most religious country in the world-but that American leadership is often as secular as Sweden, the most secular country in the world. And the tone deafness between these two groups causes a lot of national friction. The Trinity Forum was built upon Berger's remark-as well as upon the historical precedents set by William Wilberforce." 
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- "By our uncritical pursuit of relevance we have actually courted irrelevance; by our breathless chase after relevance without a matching committment to faithfulness, we have become not only unfaithful, but irrelevant; by our determined efforts to redefine outselves in ways that are more compelling to the modern world than are faithful to Christ, we have lost not only our identity but our authority and our relevance. Our crying need is to be faithful as well as relevant" (Prophetic Untimeliness, p. 15).
- Interview with Os Guiness, by Don Matzat
- Differences Make a Difference (from Time for Truth: Living Free in a World of Lies, Hype & Spin)