Tim Muehlhoff (PhD, University of North Carolina) is a professor of communication at Biola University in La Mirada, California, and a speaker and research consultant for the Center for Marriage and Relationships. His books include I Beg to Differ, Authentic Communication, The God Conversation, and Defending Your Marriage.

Together with Richard Langer, he is the coauthor of Winsome Persuasion, which received a 2018 Christianity Today book award in apologetics/evangelism. In addition to teaching and writing, they are codirectors of The Winsome Conviction Project, which seeks to introduce civility and compassion into our discussion of differences.

Muehlhoff and his wife, Noreen, are frequent speakers at FamilyLife Marriage Conferences.

Richard Langer (PhD, University of California, Riverside) is professor of biblical and theological studies at Talbot School of Theology and director of the Office for the Integration of Faith and Learning at Biola University.

Together with Tim Muehlhoff, he is the coauthor of Winsome Persuasion, which received a 2018 Christianity Today book award in apologetics/evangelism. In addition to teaching and writing, they are codirectors of The Winsome Conviction Project, which seeks to introduce civility and compassion into our discussion of differences.

An ordained minister, Langer previously served as senior associate pastor of Trinity Evangelical Free Church in Redlands, California, and as a missionary with Campus Crusade for Christ. He also speaks at seminars and conferences around the country and is a board member for Forest Home Ministries. He and his wife, Shari, have two grown children.

Tom Doyle is the president and founder of Uncharted
Ministries, which seeks to inspire the Body of Christ to
rise up and join the new great awakening among
Jews and Muslims in the Middle East and in uncharted
territories around the world.
Tom graduated from Biola College in 1979 and Dallas Theological Seminary in 1983 and is a licensed guide for the State of Israel, having led more than 80 trips. After pastoring churches in Colorado, Texas and New Mexico for 20 years, he began working full-time in the Middle East in 2001.
Additionally, Tom is a master storyteller with several books highlighting God’s miraculous work among the Muslim people.
His most recent endeavor is a new book co-authored with his wife, “Women Who Risk: Secret Agents for Jesus in the Muslim World,” releasing January 2021, which reveals true stories of women in the Middle East who have given their lives to Jesus and left Islam.

JoAnn Doyle served as a pastor’s wife and mother to six before God called her family to work full-time in the Middle East in 2001. There, she was surprised to discover a passion in her spirit for Muslim women, which led her to launch the ministry of which she is founder and president, Not Forgotten.
The Not Forgotten team has ministered in Israel, Egypt, Gaza, The West Bank, Jordan, Lebanon, Afghanistan, India, Korea and the U.S. The ministry reaches out to all women of the Middle East, North Africa and Central Asia but is specifically called to reach Muslim women with the love of Christ.
In 2017, JoAnn joined her husband Tom in launching Uncharted Ministries, which calls believers to join God’s great harvest field among Jews and Muslims. She is also a regular guest on national radio programs. She also contributed to the book “Breakthrough – The Return of Hope to the Middle East” written by her husband,
Tom.
Recently, JoAnn was invited to host “Flourish,” a brand new women’s TV program broadcasting the name of Jesus into Iran, home of the fastest-growing church per capita, which is predominantly led by women.
Her latest endeavor is a new book co-authored with Tom, “Women Who Risk: Secret Agents for Jesus in the Muslim World,” which reveals true stories of women in the Middle East who have given their lives to Jesus and left Islam.