Justin is a theologian, bishop, professor, and author whose work focuses on theology, apologetics, abuse prevention and response, and discipleship. He is the author or editor of twenty-four books on theology, abuse, and biblical studies.

Justin is the bishop of the Episcopal Diocese of Central Florida, where he previously served as the canon for vocations (2013 to 2023). He has taught theology and apologetics at Reformed Theological Seminary since 2000. He previously taught at the University of Virginia, Emory University, Gordon-Conwell Theological Seminary, and Agnes Scott College and has served as a visiting professor at Nashotah House Theological Seminary and Westminster Seminary California.

He is a co-host for the White Horse Inn podcast and was a co-host for the As In Heaven podcast. Justin serves on the boards of GRACE (Godly Response to Abuse in Christian Environments) and The Living Church Foundation. He previously served on the board of Leaders Collective and HeartSupport. Justin and Lindsey helped co-found REST in 2009.

Justin graduated from Southeastern University in 1994 with a B.A. in Biblical Studies. He earned M.A. degrees in Theological Studies and in Christian Thought from Reformed Theological Seminary and studied at the University of Oxford for a semester. He earned his Ph.D. in Theological Studies with a concentration in Comparative Religious Studies from Emory University.