I envision the About the Authors (co-authors) material to go on the inside page of the back cover, or in the final pages, so it won't be on the cover, but I've pasted it below to give you an idea of who you're working with:
ABOUT THE AUTHORS
Once a devout atheist, William Ray became a Christian through a personal experience with Jesus Christ. After serving as a pastor for 25 years, mostly in the Phoenix area, William retired (early) to pursue writing projects, serve in a jail ministry, and oversee his sermon illustration service for pastors, illustrationsforsermons.com. In addition to Burden Stone, William is the author of Answered Prayer: The Jesus Plan, the light-hearted reference book The 100 Most Entertaining Predictions about the 21st Century, and the practical reference book Bible Sidekick: Study Helps for Believers New and Old. William holds the Master of Divinity degree from Southwestern Baptist Theological Seminary and an English degree from Grand Canyon University. William and his wife Lynette have been married for 34 years and have two lovely daughters and two absolutely beautiful granddaughters.
Contact information: email@example.com
Chris Danielson is an author, film maker, and conference speaker. He has spent over 30 years in radio, including the last 15 years alongside his wife in “The Chris and Emilee Show.” In addition to Burden Stone, Chris is the author of Bible Sidekick: Study Helps for Believers New and Old and writer and director of the engaging documentary Bible Idiots, in which he also appears. Chris’ passion is creatively teaching the Scriptures, which he has done as a pastor, a missionary, and a stand-up comic. Chris also loves sports (for which he has served as an on-air host); but if not enjoying football, hockey, or NASCAR, you’ll find him with his granddaughters Riley and Quinn (and probably giving them whatever they want).
Contact information: firstname.lastname@example.org