Mark Labberton is president of Fuller Theological Seminary in Pasadena, California. He previously served as Lloyd John Ogilvie chair for preaching and director of the Lloyd John Ogilvie Institute for Preaching. Labberton came to Fuller after sixteen years as senior pastor of First Presbyterian Church of Berkeley, California. He has served as chair of John Stott Ministries (now Langham Partnership) and co-chair of the John Stott Ministries Global Initiative Fund. Today he continues to contribute to the mission of the global church as a senior fellow of International Justice Mission. He is the author of The Dangerous Act of Loving Your Neighbor and The Dangerous Act of Worship.

Sandra Maria Van Opstal is a Chicago-born, second-generation Latina and a leading practitioner of multiethnic worship. She was worship director for the Urbana Student Missions Conference and regularly serves as a worship leader and mission trainer with Christian colleges, conferences and local churches. She is a pastor at The Grace and Peace Community in Chicago and is the author of The Mission of Worship.