John Piper is founder and senior teacher of desiringGod.org and chancellor of Bethlehem College & Seminary. For 33 years, he served as pastor at Bethlehem Baptist Church, Minneapolis, Minnesota. He is the author of more than 50 books, and more than 30 years of his preaching and teaching is available free of charge at desiringGod.org. John and his wife, Noël, have four sons, one daughter, and fourteen grandchildren.

Dr. Paul David Tripp is a pastor, event speaker, and a best-selling and award-winning author. With more than 30 books and video series on Christian living, Paul's driving passion is to connect the transforming power of Jesus Christ to everyday life. He and his wife of 45+ years, Luella, live in Philadelphia; they have four grown children. For more information, visit PaulTripp.com or follow Paul on Facebook, Twitter, and Instagram.

After receiving a piano performance degree from Temple University in 1976, Bob traveled for eight years with the contemporary Christian group GLAD as a songwriter, speaker, and arranger. He continued to write and arrange for the group until 2010, and was a major contributor to The A Capella Project (1988). In 1984, he left GLAD to pursue active involvement in a local church associated with Sovereign Grace Ministries. In the early 90s, he helped to plant what is now CrossWay Community Church in Charlotte, North Carolina, and was featured on the Integrity's Hosanna! CD, Chosen Treasure. In 1997, after 12 years of pastoring, Bob moved to Gaithersburg, Maryland, where he led corporate worship at Covenant Life Church and became the Director of Sovereign Grace Music. His book, Worship Matters, was published by Crossway in 2008. Through conferences, seminars, and his blog, Worship Matters (www.worshipmatters.com), he seeks to equip pastors, musicians, and songwriters in the theology and practice of congregational worship. He also oversees the production of Sovereign Grace albums. He currently is involved in another church plant in Louisville, KY, led by CJ Mahaney. Bob and his wife, Julie, were married in 1976. The are blessed with six children and an ever growing number of grandchildren.

With Pastor Mark, it’s all about Jesus! He is a spiritual leader, prolific author, and compelling speaker, but at his core, he is a family man. Mark and his wife Grace have been married and doing vocational ministry together since 1993 and, along with their five kids, planted Trinity Church in Scottsdale, Arizona as a family ministry.

Pastor Mark, Grace, and their oldest daughter, Ashley, also started RealFaith Ministries, which contains a mountain of Bible teaching for men, women, couples, parents, pastors, leaders, Spanish speakers, and more. For free sermons, answers to questions, Bible teaching, and more, visit RealFaith.com or download the Real Faith app.

Pastor Mark has been named by Preaching Magazine one of the 25 most influential pastors of the past 25 years.

With a master’s degree in exegetical theology from Western Seminary in Portland, Oregon, he has spent the better part of his life teaching verse-by-verse through books of the Bible, contextualizing its timeless truths and never shying away from challenging, convicting passages that speak to the heart of current cultural dilemmas.

Together, Mark and Grace have co-authored Win Your War and Real Marriage, and he co-authored a father-daughter project called Pray Like Jesus with his daughter, Ashley. Pastor Mark has also written numerous other books including Spirit-Filled Jesus, Who Do You Think You Are?, Vintage Jesus, and Doctrine.

JUSTIN TAYLOR is vice president of book publishing and an associate publisher at Crossway. He has edited and contributed to several books, including A God-Entranced Vision of All Things and Reclaiming the Center. He blogs at "Between Two Worlds," hosted by the Gospel Coalition, and runs the website www.johnowen.org.