Eric Geiger es el pastor principal de Mariners Church en Irvine, California. Anteriormente, se desempeñó como vicepresidente senior en LifeWay Christian Resources. Recibió su doctorado en liderazgo y ministerio eclesiástico del Southern Seminary y ha escrito o coescrito varios libros, incluyendo "Creature of the Word", "Simple Church", "Designed to Lead" y "How to Ruin Your Life". Eric y su esposa, Kaye, tienen dos hijas, Eden y Evie.
Michael Kelley is director of Discipleship at LifeWay Christian Resources. His previous works include Holy Vocabulary, The Tough Sayings of Jesus, and Wednesdays Were Pretty Normal. He holds a Master of Divinity degree from Beeson Divinity School in Birmingham, Alabama. Michael and his wife have three children and live in Nashville, Tennessee.