Jonathan Leeman (PhD, University of Wales) is the editorial director for 9Marks and an elder at Capitol Hill Baptist in Washington, DC. He has written for a number of publications and is the author or editor of a number books. He is also an occasional lecturer at Southeastern Baptist Theological Seminary and teaches adjunctively for the Southern Baptist Theological Seminary. Jonathan lives with his wife and four daughters in a suburb of Washington, DC. Mark Dever (PhD, Cambridge University) is the senior pastor of Capitol Hill Baptist Church in Washington, DC, and president of 9Marks (9Marks.org). Dever has authored over a dozen books and speaks at conferences nationwide.