John Piper is founder and teacher of desiringGod.org and chancellor of Bethlehem College & Seminary. For 33 years, he served as pastor of Bethlehem Baptist Church, Minneapolis, Minnesota. He is author of more than 50 books, including Desiring God: Meditations of a Christian Hedonist and most recently Foundations for Lifelong Learning: Education in Serious Joy.

Wayne Grudem is research professor of theology and biblical studies at Phoenix Seminary and author of Systematic Theology. He co-founded the Council on Biblical Manhood & Womanhood and served as the general editor of the ESV Study Bible.

John E. Kyle complied the book Perspectives on the Unfinished Task and contributed to Missions Now: This Generation.

Don Williams (Ph.D.) is pastor emeritus and founder of Coast Vineyard in La Jolla, California.