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 Conviction and 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.