Our Presenters

As Founder and President of the Christian Grandparenting Network, Calvin is the author of Courageous

Cavin Harper

As Founder and President of the Christian Grandparenting Network, Calvin is the author of Courageous Grandparenting, Living Your Will, A DIY GrandCamp Field Guide, and Wayfinder (a novel). 

He and his wife, Diane are the creators of GrandCamps, founded in 1998. He writes a weekly blog, hosts a grandparenting podcast called Family Impact, and travels as a speaker and presenter of Courageous Grandparenting seminars and workshops in churches throughout the US and Canada.

Calvin and Diane were married in 1969, have two daughters and nine grandchildren. Their home is in Colorado Springs. 

Josh Mulvihill

Josh Mulvihill is the Executive Director of Church and Family Ministry at Renewanation, where he equips parents and grandparents to disciple their family and consults with church leaders to help them design Bible-based, Christ-centered family ministries with a focus on biblical worldview.

Josh has served as a pastor for nearly 20 years, is a founding member of the Legacy Coalition where he serves as the Director of Resources, and has a PhD from the Southern Baptist Theological Seminary. He is a regular main stage speaker and workshop presenter at conferences and popular radio guest on programs such as Moody radio and FamilyLife Today. Josh is the author of Biblical Grandparenting, Preparing Children for Marriage, and Rooted Kids Curriculum and Worship.

Josh and his wife Jen live in Victoria, MN and are blessed with five children. Connect with Josh on Facebook or the web at GospelShapedFamily.com

Deborah Haddix

Deborah Haddix serves as co-coordinator for Christian Grandparenting Network’s Grandparents’ Day of Prayer. She is also an author, blogger, speaker, and Christian Life Coach. Passionate about helping grandparents become more intentional and effective in carrying out their biblical role, Deborah developed the 30-Day Praying with Purpose Prayer Challenge for Grandparents and Praying in Color for Your Grandchildren.  She is also the author of Praying with Purpose: Taking Your Prayer Life from Vague to Victorious. 

The author of other titles including Soul Nourishment: Satisfying Our Deep Longing for God and Journaling for the Soul: slow down, replenish, exhale, a Handbook of Methods, Deborah also serves on the faculty of National Association of Christian Journal Writers and is an active member of her church.  She has ten grandchildren and answers to Grandma, Mimi, G-ma, and Mammaw. 

Wayne Johnson

Associate Pastor and Associate Professor of Theology.  M.Div. (International School of Theology), ThM in New Testament and Ph.D. in Theological Studies (Trinity Evangelical Divinity School).  Served with Cru (Campus Crusade for Christ) for 36 years, 28 of those years with the Nairobi International School of Theology in Kenya.  Currently is serving as Pastor for Spiritual Formation and Chapel Sages at The Bible Chapel in McMurray, PA.

Married for 39 years with three children and three grandchildren.

Larry McCall

Larry has served as a pastor at Christ’s Covenant Church of Winona Lake, Indiana since 1981. He also is the founder and director of Walking Like Jesus Ministries, speaking at retreats and conferences as the Lord provides opportunities. He has written a number of articles and is the author of three books, Grandparenting with Grace: Living the Gospel with the Next Generations, Walking Like Jesus Did and Loving Your Wife as Christ Loves the Church. Pastor Larry received his BA in New Testament Greek in 1976 and MDiv in1979 from Grace College and Theological Seminary. In 1993, he went on to complete his Doctor of Ministry at Trinity Evangelical Divinity School in Illinois. Larry’s aspiration is to be a useful tool in the Lord’s hand in “spreading the fragrance of the knowledge of Christ” (2 Corinthians 2:14) through his life, teaching and writing.

When Larry gets time to relax, he enjoys spending time with his wife Gladine, being with his kids and grandkids, reading books on history, or paddling around in his kayak

Sherry Schumann

A retired math and science teacher, Sherry Schumann serves as the prayer coordinator for Christian Grandparenting Network and writer for Legacy Coalition. She delights audiences with bits and pieces of her own redemption story as she delivers a powerful message about prayer.

She and her husband of thirty-five years reside in Moncks Corner, South Carolina, with their English setter named Finley. They treasure spending time with their three sons, three daughters in love and four precious grandchildren. Sherry’s novel, The Christmas Bracelet, makes readers laugh and cry, sometimes simultaneously.

Mark Adcock

Mark Adcock and his wife, Angela, pastor New Life Christian Fellowship in Fortville, IN. They have just concluded their 25th year of ministry there having planted the congregation in 1993. Both Mark and Angela are certified Biblical Counselors who feel a call to help individuals and families to learn to use God's Word as the instruction book for their lives.

Mark is the author of A Call to Grandparenting, Lessons Learned on Papa's Pond, and Be Strong and Show Yourself a Man. Mark and Angela worked together to write Developing Spiritual Oneness Through Prayer. The Adcocks have been married for 39 years and have two grown children, both of whom are married, and they have 5 grandchildren.

Mark's faith was shaped by the tremendous investment of his maternal grandfather who taught him on the banks of his pond. Now the Adcocks are excited to be passing faith on to their grandchildren and are active in teaching and motivating other grandparents to lead their grandchildren into a deep walk of faith. 

Lillian Ann Penner

Lillian Ann Penner is an author, speaker, and grandmother residing with her husband, John, in Portland, Oregon. They have been married for more than fifty years and have three married sons and nine grandchildren.

Penner is the national prayer coordinator for Christian Grandparenting Network (CGN), and she writes about her passion of intentional praying grandparents for CGN’s website. She is involved in leadership in the women’s Bible study, the fifty-five plus group in her church, and leads a Grandparents@Prayer group.

She has been active in church ministry for over fifty years, led an outreach ministry for young mothers, a mentoring ministry for women, and various other church ministries. She has participated in short term missions in Ukraine and volunteered with several Christian ministries.

She and her husband enjoy traveling, but most of all, enjoy spending time with their children and grandchildren.

Glenn Havumaki

Glenn has been ministering to older adults since 1976. He recently retired after serving as Director of Christian Ministries and Lead Chaplain for 35 years at The Elim Park Baptist Home in Cheshire, CT. Glenn is the author of the book, Trashed or Treasured: A Short Practical Theology of Aging, which won Second Place in the Theology Category of the 2012 Christian Choice Book Awards.

He has been married for 43 years to his wife, Sandra, and has three married children and seven grandchildren. Since his retirement, he and Sandy have been Certified Partners with the Christian Grandparenting Network (CGN) and trained to lead the Courageous Grandparenting Seminar.  They are also Ambassadors for the Legacy Coalition: Grandparenting Matters.

Jim Clouser


Having served as a Pastor for nearly 20 years, it became apparent to Jim that churches, and people of faith, need voices they can have confidence in when it comes to financial advice. Jesus talked extensively about stewardship and the wise use of resources in many of His parables. As a Pastor, people would come to Jim for advice in many areas of life, but the one area where he felt least equipped to help was in the area of finance. It became apparent that he could become one of those people providing needed advice to the Christian community and beyond. After much study and experience, he finally became associated with Thrivent Financial, a company that demonstrates its commitment to service the faith community with products and services designed to meet many financial needs.  Jim is also a active grandfather with seven grandchildren.

Willie Batson

Willie Batson is an engaging presenter who speaks nationally with authority on today’s family relationships. He inspires his audience with practical information that challenges couples and parents to work together through relational issues with a Christ-centered approach. Willie brings both humor and practical wisdom to his presentations. It is the exact right combination. His work genuinely reflects a calling from God in his life.

Willie is a published author, having written his first book, Tools for a Great Marriage, in 2008 and his second book, Tools for a Great Marriage DEVOTIONAL, in 2014. It has enjoyed worldwide distribution and gain acclaim from readers and noted authors such as Dr. Gary Chapman (The Five Love Languages) and David & Claudia Arp (10 Great Dates series). A second book, authored by Willie and his late wife Cindy is geared specifically for couples dealing with a chronic illness or disability in their marriages. He has also had articles and columns published in such national publications as The AC Witness, Children’s Ministry Magazine (Group), and Living with Teenagers (LifeWay).

Catherine Jacobs

Catherine Jacobs worked as the Children and Family minister at her home parish, St. Paul’s Church, Summerville for fourteen years. Upon retirement, she founded an independent ministry, Pass the Legacy. As Executive Director, Catherine speaks and writes to impact grandparents. She is a charter member of Legacy Coalition, the first national ministry designed to encourage grandparents. Also, she is a founding member of Grandmas with Heart, a ministry to equip and empower grandmoms. Her book, Pass the Legacy: 7 Keys for Grandparents Making a Difference, is being published at Elm Hill Publishers. It will be available in the fall of 2018. The joy of her life is when her five grandkids crash at her house for a sleep-over.