Mike Harder has been the President of Concentric since 2018. He has a passion for disciple-making like Jesus through training, coaching and mentoring emerging leaders. He has served in ministry for several decades in various church roles including helping lead a church planting network. Born in West Berlin, Germany in a military family, he grew up in the NYC metro area. He has contributed to several periodicals and books and authored, Engage: A Youth Worker’s Guide to Creating a Culture of Mentoring. He and his wife, Teresa, have three grown children, all of which live near to them in the Philadelphia suburbs. Teresa works for the American Bible Society.

John North is the Founder and President of Evangelism Shift, an organization that trains church leaders and members to live as witnesses for Jesus in their daily encounters with people. This ministry began in Australia and has expanded to several other continents including North America and Europe. John is an author, frequent speaker at conferences and churches, and the hosts of a Christian radio show in Sydney, Australia.  John was born in India to missionary parents and formerly served as the National Director in Australia for Ambassadors for Christ International, an organization his father founded. He and his wife, Lois, have four children and live in Sydney, Australia.

Benjamin lives in India with his wife, Gillian, and their daughter, Abigail, who is currently a university student. He is one of the first Disciple Makers Big Life recruited in 2003. He began a Disciple Making Movement in a village outside Kolkata which grew by God’s grace exponentially over the last 18 years to more than 30,000 Fellowships and Jamats all across South Asia. These Fellowships and Jamats are disciple-making environments where disciples are raised and multiplied to reach out to the unreached and equip them to do the same. He presently serves as Global Catalyst through coaching, mentoring and training in most of the areas Big Life works.

Peter Roennfeldt has spent his life sharing the gospel, planting churches, and serving as a pastor to pastors, with special interest in Jesus’ life as our model for disciple-making and movement thinking. Having lived in four countries and equipped almost 60 church-planting teams, Peter now lives in Melbourne, Australia, with his wife Judy, and continues to provide resources and equipping for church planters and movement leaders to multiply churches – including mission-hub churches and households of faith. He has authored several books including Following the Apostles’ Vision, featured at the Concentric Summit this year. Peter led the creation of our Seven Churches Tour and related tools for the Summit.