Ligon Duncan (PhD, University of Edinburgh) is chancellor and CEO of Reformed Theological Seminary, president of RTS Jackson, and the John E. Richards professor of systematic and historical theology. He is a board and council member of The Gospel Coalition. His new RTS course on the theology of the Westminster Standards is now available via RTS Global, the online program of RTS. He and his wife, Anne, have two adult children.
Tim Keller (MDiv, Gordon-Conwell Theological Seminary; DMin, Westminster Theological Seminary) was founder of Redeemer Presbyterian Church (PCA) in Manhattan, chairman of Redeemer City to City, and co-founder of The Gospel Coalition. He wrote numerous books, including The Reason for God. He and his wife, Kathy, had three children.
Crawford Loritts (DDiv, Biola University; STD, Cairn University; DDiv, Moody Bible Institute; LTD, Trinity Evangelical Divinity School; DDiv, Columbia International University) is former senior pastor of Fellowship Bible Church in Roswell, Georgia, visiting professor at Trinity Evangelical Divinity School, and a Council member of The Gospel Coalition. He has written a number of books, including Unshaken. He and his wife, Karen, have four children.
John Piper serves as founder and lead teacher at Desiring God and is chancellor of Bethlehem College & Seminary. For 33 years, Piper served as pastor of Bethlehem Baptist Church, and he is a Council member of The Gospel Coalition. He has authored more than 50 books, and more than 30 years of his preaching and writing are available free of charge at desiringGod.org.
Stephen Um (PhD, University of St. Andrews) is senior pastor of Citylife Presbyterian Church in Boston, Massachusetts, the president and executive director of The Center for Gospel Culture. He is the author of Micah for You: Acting Justly, Loving Mercy. He and his wife, Kathleen, have three children.