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Executive and Lead Team

Concentric is led by a group of veteran ministry leaders from around the world.

Concentric is led by a group of veteran ministry leaders from around the world.

Mike Harder, the current President is advised by our Executive Team made up of Bill Hodgson, National Leader SHIFTm2M- Australia, Dave Patty, President of Josiah Venture, and John Abrahamse, President of J Life Africa. 

Our Executive Team works closely with our Leadership Team which comes from representatives of our nine alliance organization partners with a footprint that represents over 130 countries.  The leadership team is responsible to establish vision, mission, and direction; along with monitoring progress in building movements of multiplication.


Mike Harder

Mike has served in ministry for over thirty years including various pastoral roles churches, and as President of Concentric since January 2018. Born in West Berlin, Germany, as the son of a US military officer, Mike grew up in the NYC metro area. His Christian faith took root in his teenage years, given him a heart for ministry among young people.

After attending Messiah College and Evangelical Seminary, he served on a church plant team and then went on to be a youth pastor for over 25 years. In 2011 he helped launch a second campus for a city church focused on reaching intellectual skeptic. There he there served as the executive pastor giving oversight to organizational leadership for their two campuses and helping birth a new counseling center and a non-profit to serve the needs of vulnerable in the city.

Mike has served on several nonprofit boards including Sonlife North America and Atlantic Bridge Netherlands YFC. He was a Sonlife trainer and the east coast coordinator for the ministry for sixteen years. He currently serves on Board of Directors for Sonlife North America.

Mike has contributed to several periodicals, coauthored a book on youth ministry and authored a book on mentoring relationships titled, Engage: A Youth Worker's Guide to Creating a Culture of Mentoring. He served as an adjunct professor in youth ministry at Lancaster Bible College, and as a consultant for churches and nonprofits in executive leadership and strategic planning.

He and his Teresa attend Grace Valley Fellowship Church in Phoenixville, PA where Mike serves as an elder. He and Teresa live in the Philadelphia suburbs and have three children. Teresa works for the American Bible Society in partnership development.

Over the last 33 years Mike has served in various pastoral ministry roles including as lead pastor, youth pastor, executive pastor, and campus pastor. He now serves as President of Concentric Global.


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Executive Team

Serving alongside Mike Harder


Bill Hodgson

Bill Hodgson is a veteran of 40 years in mission with Power to Change (formerly CCC Australia). From 1979-1998 he founded and led the Youth Strategy, training and coaching youth pastors to reach and disciple young people in schools. He then served as National Director from 1999 - 2013. In 2010 Bill launched SHIFTm2M as a strategy to mobilize and equip church leaders to make the shift from doing ministry to building Movements framed around disciplemaking from the model of Jesus.

Since 2013 Bill has had two roles, one as National Strategy Director Church Movements/SHIFTm2M, Power to Change Australia for church movements in Australia and the other as part of a Campus Crusade’s Global Church Movements VP team with a focus on leadership development. His specialty is strategic thinking and leadership priorities drawn from the life example of Jesus.

Bill is married to his life long best friend Faye with whom he shares four married children and 12 grandchildren.

Josiah Venture

Dave Patty

Dave Patty is the founder and president of Josiah Venture, a Concentric alliance partner, that is a leadership training organization focused on equipping next generation leaders throughout Eastern Europe. He has a BA in Theology from Multnomah University and a MA in Education from Wheaton Graduate School. During the last 26 years the Josiah Venture team has grown from two couples to over 350 staff serving in 14 countries of Central and Eastern Europe. Approximately 7000 Eastern European young leaders are involved in ongoing training led by the Josiah team during the course of a typical year. Dave is well known in the region for his practical Bible teaching. He produced a weekly television broadcast called Exit 316 that aired for 82 weeks on national television and has been seen by over a million people in the Czech Republic. Dave lives with his wife Connie in Frydlant, Czech Republic. He has been involved in global youth ministry and training young leaders in Europe for the past 30 years. Dave loves to ski, chop wood, and enjoy time with his grown kids and their kids.
J-Life Africa

John Abrahamse

Is the International Director of J-Life Africa. J-Life Africa (a Concentric alliance partner) is a non- denominational movement that exists to develop leaders who mobilise disciplemaking movements based on the life and model of Jesus across the African continent. John grew up in South Africa and has been married to Lorna for over 25 years. They have three children, Jordan, Nathan and Jamie. In the mid-1990 John pastored for 6 years in the South of Johannesburg and then together with Lorna they stepped out pastoring to pioneer J-Life Africa (2001) and have been serving with J-Life ever since then.

Mike Harder

Mike attended Messiah College and Evangelical Seminary in Pennsylvania, USA. Over the last 33 years he has served in various pastoral ministry roles including as lead pastor, youth pastor, executive pastor, and campus pastor. Recently, Mike helped start a multi-site church in Philadelphia. Mike and his wife Teresa live in the Philadelphia suburbs with their children, Nathan, Lauren and Arianna and attend a Grace Valley Fellowship Church, where he serves part time as the Pastor of Leadership Development mentoring staff.
Concentric Global

Jim Culbertson

Jim Culbertson has been a church planter, pastor, and denominational leader within the Evangelical Free Church of America for nearly four decades. In addition to Jim's role with Concentric, he serves as President at New England Bible College & Seminary training the next generation of church leaders.

Jim received his Ph.D. in Leadership from Lancaster Bible College/Capital Seminary. He and Wendy-Jo have 3 adult children, a daughter-in-law and a son-in-law. Wendy-Jo, has been deeply involved in the ministry of Fair Haven Camps for many years and currently serves as board chair and program director.

Concentric Global

Katie Yates

Katie Yates has served in various capacities since 2015 with Concentric Global. As recently as 2023, she served as the Be the Sequel Summit Executive Administrator. She has also been involved with past Israel Study Tours, and served as the Operations Manager for our alliance partner Sonlife North America for 9 years. Katie also serves alongside her husband, Josh, with Josiah Venture, working with the JV Leadership Lab and the HR USA Team. Katie brings strong organizational leadership gifts and a disciple-making passion. She serves directly with Concentric President, Mike Harder on the Executive Staff Team.
Katie lives in Portland, Oregon with her husband and their two kids.

Lead Team

The President and Executive Team members also serve on the Leadership Team.


Doug Holliday

Doug Holliday serves as the Executive Director of Sonlife Ministries, providing vision and leadership for a growing team of ministry staff across North America. Doug is a thirty-plus year veteran of ministry, having served as a youth pastor, teaching pastor and church planter in Illinois, New Jersey, and Florida prior to joining the Sonlife team as Southeast Regional Coordinator in 2001. He has proclaimed Christ and equipped ministry leaders in almost 40 countries, serving extensively in East Africa and the Caribbean. Doug and his wife Jennifer live in Lake Mary, Florida and have six daughters.

Dann Spader

Dr. Dann Spader (Moody Bible Institute, Trinity Evangelical Divinity School) has dedicated his life to disciple-making, teaching others how to take someone from seeker to making disciples themselves. More than 1 million people in 100 plus countries have been trained to make disciples through organizations he has led. He is the founder of Sonlife Ministries and he has dedicated his life to disciple-making. Dann is the author of 4 Chair Discipling, Walk Like Jesus and Live Like Jesus. He has written more than a dozen leadership training manuals, contributed to several other books, written numerous articles, and produced over 30 training videos.

He and his wife, Char, have three daughters and live in Phoenix, Arizona.


Mark Edwards

He spent the early years in ministry working for Sonlife Ministries (Concentric Alliance Partner) in Chicago, IL. He worked for Sonlife providing leadership training in the life of Christ for youth workers and youth pastors across the USA and Canada.

He has served with Sonlife Latin America for over 25 years. His family moved to Costa Rica in December of 1994 to birth Sonlife Latin America. Sonlife Latin America works to train younger leadership in the life of Christ. They focus on helping the next generation to be and act like Jesus. They desire to see a generation of young people who possess both the character and priorities of Christ. Young people who display the character of Christ, as seen in the life of Jesus and attested to by the Apostle Paul in Philippines 2:5-8. They also desire to see young people possess the priorities of Christ as seen in the life of Jesus and attested to by the Apostle Paul in Acts 26:16-18. He now work across Latin America discipling, coaching and mentoring emerging leaders in the life of Christ. Jesus and the Apostle Paul are his models working “until Christ is formed” in others (Galatians 4:6). Make disciples who make disciples as Jesus and Paul did.


Diego Araya

For the past 15 years Diego has been living the big dream that started in his heart when he served as a young teen in his local youth group. As a gifted communicator and influencer, he is a youth pastor and consultant, training leaders throughout Latin America with ministry principles from Jesus´ life. He travels throughout Latin America equipping local leaders in Jesus' model.

He is a committed husband and a fun dad who is passionate about Jesus, takes refuge with his guitar and contributes incredible design work to the global disciple-making movement.


Don Roscoe

Don is a life-long resident of Michigan, having grown up in Battle Creek and graduating from Springfield High School. Converted to Christ in the early 1970’s, Don served in a local church for 5 years as a lay-pastor while he took classes from Liberty Institute and Moody Bible Institute. In 1978 he entered full time ministry and served in the Maple Valley community as a youth pastor until he planted Grace Community Church of Nashville, MI in 1993.
Don served as the Training Coordinator for Sonlife Ministries for over 35 years and today travels extensively through-out North America and internationally training church leaders, acting as a consultant and coach, and conference speaker. For over 2 1/2 decades, Don has served as a coach / consultant of the South Asian Sonlife team with Andrew Tay of Singapore where they are leading a number of national training and coaching teams’ through-out the region
Don was married to Sherry for nearly 28 years before she passed away suddenly in March 2000 and they have two children and four grandchildren. Since then Don has remarried, and his wife’s name is Evie.
Don is an avid sports fan with a passion for all kinds of sports. He has coached a number of sports in his community, public and Christian schools during the past 40+ years – at all age levels. Don recently retired after coaching varsity high school football for 30 years so he could devote more time to multiplying leaders around the world.

Michele Montenegro

Michele, native to the United States, moved to Costa Rica after university to learn Spanish, and has now spent for half of her life making and training disciples throughout the region. She loves people and is passionate about the continual study of Jesus´ life on Earth - especially the evident participation of women in His 1st century movement.

In 2019, Michele and a team of Latin missionaries started a new organization named Singular (a Concentric Alliance Partner). Singular is a pioneering non-profit organization uniquely birthed in Latin America to mobilize disciple-makers. A diverse group of people united by a singular focus on Jesus and a call to walk alongside local churches and ministries who want to learn how intentional relationships can form movements that transform the world. As the Strategic Coordinator of Singular, she is a happy wife and a learning mom and leads the Singular Executive Team in strategic direction and communication, leaning always into communal discernment.

J-Life Africa

Simdinatome M’gliwè

SIMDINATOME M’gliwè is the Regional Director in French-speaking West Africa for J-Life Africa. J-Life Africa (a Concentric Alliance Partner) is a non-denominational movement that exists to develop leaders who will mobilize disciplemaking movements across Africa. Mgliwè oversees 7 countries in the region and help develop other countries.

He attended International School of Ministry from USA and represented in Togo and Global Proclamation Academy at Dallas Theological Seminary. In 2014, he was trained to develop mentoring communities in Africa by Dr. Leighton Ford in Apple Hills, Charlotte, North Carolina. He is also the Lausanne Movement Younger Leaders Regional Contact Person in Francophone West Africa. Pastor M’gliwè is an internationally recognized speaker in African and beyond. He is the lead pastor of Restored Community for Christ church in Togo graduated in banking and finance and accounting sciences, Pastor M’gliwè is a seasoned entrepreneur. He is married Rhoder and a loving father of 4 children: Fidèle, Hilaire, Percée and Doxine.

Campus für Christus

Simon Loeffel

My name is Simon Loeffel and I am serving with Campus für Christus in Switzerland (Cru). I am the Director for SHIFT in Western Europe and leading it under the Name/Brand MyFriends Movement in Switzerland. I worked as a mechanic, studied Theology at Chrischona International and started to train leaders in Youth-Scout ministry. Within CRU Switzerland I led the Internet Ministry and was Director of . Then we created the MyFriends Lifestyle. This lifestyle is based on Jesus and how he encounters with people, to let them experience Gods love in their life. Before three years, we combined the MyFriends Lifestyle and SHIFT (Concentric content) to a full learning and training for local churches in Switzerland and aboard. We focus first on the leaders of local churches to help them to see Jesus as a role model in disciplemaking movement and help them to shift their few about Jesus and the call of their own church. Second we train the whole congregation with the MyFriends Lifestyle, who helps them to build up a lifestyle of practical disciplemaking. I’m married with Conny and we have two kids, a boy Dylan and a girl Delilah.
Josiah Venture

Maruška Skonc

Maruška is part of Josiah Venture's ministry in Eastern Europe. Specifically in Slovakia where she serves in leadership of national organisation Training Centre Kompas that trains youth leaders and disciple makers across the region. Maruška is part of preparation team of the biggest training conference in Slovakia and Central Europe called KPM. She is author of 8 books, 3 of them are materials for discipleship small groups of teenage girls and boys. She is married, her husband Daniel is part of Josiah Venture team as well.

Chin Tat Him

My first exposure to making disciple was in the year 2,000 when I attended the Growing a Healthy Church Strategy Seminar in Singapore. I realised then that I was merely an M1 disciple while serving full time in Sengkang Methodist Church as a Local Ministry Staff. I was even more convinced about the need for a movement of multiplying disciples who make disciples to finish the Great Commission when I started training others using Sonlife materials since 2003. In the process of training others, I was challenged to walk as Jesus walked personally. And also to slowly think and act like a movement leader that implement Jesus’ strategy in the ministry I’m involved on personally and those I’m coaching. At the moment I’m closely following through with a few of the Pastors and Leaders in various countries on both personal and ministry matters. After almost 20 years of teaching and trying to create disciple-making movement as Jesus did, we are now moving into the launching of Disciple-making Coaching Centers (DCC) in the countries we are serving. The end goal is to reproduce L4s (movement leaders that launch DCC) and to multiply DCC to coach churches to finish the Great Commission. We are praying and trusting God for 2,000 DCCs by the year 2025. We are also praying and asking God for all the resources needed to bring this vision to pass. Chin Tat Him/57/Singapore/IDN

Josh Yates

Josh grew up in Woodinville, WA, and at the age of 12, sensed God's call into ministry. It was through his youth pastor and other godly men, Josh refined his calling specifically in youth ministry. In 2000, he earned his BA in Family Ministries from Moody Bible Institute in Chicago. Upon graduating Josh accepted his first full-time youth ministry position in Lynden, WA and in 2005 moved to Portland to further his education also while serving as a youth pastor locally. In 2011, Josh and Katie followed God’s call to become missionaries to train ministry leaders in disciple-making.
Currently, Josh serves as the Associate Director of Sonlife Ministries overseeing the national offices in Portland, Oregon. Josh also trains, coaches and mentors ministry leaders across North America. His passion is to see disciple-making communities fueled by a fresh encounter with Jesus.

Josh and Katie have been married for 19 years and have two children, Foster and Jorie.

J-Life Africa

Florence Aboula Fokoua

Florence ABOULA FOKOUA, founder of I-Care Ministries International and country leader of J-Life Africa (a Concentric Alliance Partner), is a woman leader with a passion for Disciple making movement, Leadership and international communication. She holds a DEUG in Juridical and Political Sciences with a major in International Law, a Bachelor degree in Christian Education, a Master degree in Educational Science and a Master degree in Leadership.

After training in journalism and communication from 2003 to 2006, she was in turn editor-in-chief and news director in a community development radio station in Cameroon.

Florence and her husband King Leo whose vision is to multiply leaders Builders of Disciple Makers Movements in Cameroon and Francophone Africa have been happily married for over 20 years now and have two wonderful children and young leaders Ariel and Jodie.



A former banker and native to India, Benjamin, serves on our Lead Team. After leaving a banking career he felt called to ministry and started a church in his home city reaching hundreds of Muslims with the Gospel. God had other plans for “B” and soon connected him to a global mission organization called Big Life. He now travels extensively doing training and equipping of ministry leaders around the world. Growing up in a Muslim faith gave him a heart for sharing God’s love and grace with his muslim friends. He often trains and speaks in Asia, Africa, Europe and the United States.


Andrew worked for many years in corporate and institutional banking with American and European banks as well as serving in the area of evangelism and missions for denominations. Today he leads our alliance partner, IDN- Intentional Disciplemaking Network, a ministry that provides training, coaching and mentoring to ministry leaders in over dozen Asian countries. Andrew lives in Singapore with his wife and nearby his grown up children. He and his wife travels extensively for IDN and Concentric to invest in emerging leaders.