Leaders in Living Rooms

Leaders in Living Rooms


LILR 148 | Tom Mercer on Leading from 100 to 8,000 Through Personal Evangelism

December 15, 2025

In this episode of Leaders in Living Rooms, Sean Morgan sits down with longtime pastor and Oikos Movement founder Tom Mercer to unpack nearly four decades of ministry leadership at High Desert Church and the relational principles that shaped a church of 8,000 in rural Southern California. Tom shares candid stories about longevity, accountability, team chemistry, leadership development, and how the Oikos principle, reaching the world through the natural relationships God has already placed around us, became the backbone of High Desert Church’s growth. From navigating criticism and facility challenges to building a healthy staff culture grounded in prayer and friendship, Tom offers practical, grounded wisdom for leaders pursuing disciple-making and sustainable ministry.


Welcome to Episode 148 of the Leaders in Living Rooms Podcast with Sean Morgan.


EPISODE LINKS

Oikos Movement


Not My Church, by Tom Mercer


8 to 15: The World is Smaller Than You Think, by Tom Mercer


sean@theascentleader.org


theascentleader.org


If you’re a leader approaching a succession or transition, or maybe you’re a few years in and beginning to see how complex transitions leadership is… go to The Art of Pastoral Succession and check out my course in partnership with Carey Nieuwhof. 


Are you in Transition or have one on the horizon? Check out our cohorts and get connected with us at: https://theascentleader.org/cohorts/ 


WHO IS TOM MERCER?

Tom has been in pastoral ministry for almost 50 years. For 38 of those years, he served as the Senior Pastor and primary teacher at the High Desert Church in Southern California. During that time, the church grew from 125 to over 14,000 regular attenders, from one campus to four. Tom has also been an ambassador for the oikos principle around the world, frequently speaking at conferences, churches, university classrooms, and denominational gatherings. He currently serves as the President of The Oikos Movement, a non-profit organization committed to helping church leaders become more effective through simplification. Tom received his formal education at Biola University and Talbot Seminary. He is the author of three books, 8 to 15—The World is Smaller Than You Think, Not My Church, and Diary of a World Changer. Tom and his wife Sheryl have been married for 45 years. They have three married children and 11 grandchildren.


SPONSORS & PARTNERS

Thanks to our sponsor: OneHope: OneHope’s mission is to reach every child and youth in the world with God’s Word through the global church. In 35 years of ministry OneHope has reached more than 2 billion young people with the Gospel. Learn how you and your church can get involved by visiting onehope.net/learnmore/.