Leadership |

Offices of The Master's Seminary

John MacArthur

Chancellor

Abner Chou

President of TMUS

Nathan Busenitz

Senior Vice President & Dean of Faculty

Mark Zhakevich

Executive Director of Finance & Plant Operations

Austin Duncan

Executive Director of The MacArthur Center for Expository Preaching & Chair of the Doctor of Ministry Program

Jade Greenfield

Chief Development Officer

Corey Williams

Chief Communications Officer

Ben Trowbridge

Chief Student Engagement Officer

Brian Nkoana

Chief Operations Officer

Nathan LeMaster

Associate Dean of Academics

Board of Directors

Scott Ardavanis

Board Member

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Scott Ardavanis

Board Member

Scott Ardavanis is the Senior Pastor of Grace Church of the Valley in central California. Scott began his pastoral ministry at Grace Community Church with John MacArthur and also spent seventeen years as a senior pastor in Chicago and California. He is an adjunct professor at The Master’s Seminary. Scott is a featured speaker at Bible and pastors conferences around the world. He also serves as a board member for Sufficiency of Scripture Ministries, which impacts lives in Uganda with sound Biblical teaching. Scott earned his degrees at Los Angeles Baptist College (now TMU), B.A., The Master’s Seminary, M.Div., and Trinity Evangelical Divinity School, D.Min. Scott and his wife, Patty, have been married 35 years and have 7 children and 9 grandchildren. Scott has served on the board since 2017.

Brad Armstrong

Chairman of the Board

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Brad Armstrong

Chairman of the Board

Brad Armstrong is a businessman who lives in Thousand Oaks, CA. He has served on the board since 2015.

Abner Chou

Board Member

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Abner Chou

Board Member

Dr. Abner Chou began teaching at The Master's University in 2004 and continues to teach both at the university and seminary. He has served as the TMUS President since 2021.

Peter Coeler

Board Member

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Peter Coeler

Board Member

Peter Coeler is the owner of PAC Properties, a private real estate company in the San Fernando Valley. He is a graduate of The Master’s University, where he played basketball. He currently serves on the boards of Grace To You, the John MacArthur Charitable Trust, and Legacy Christian Academy.

Luis Contreras

Board Member

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Luis Contreras

Board Member

Luis graduated from The Master’s University and Seminary (B.S., M.Div., Th.M., D.Min.), was ordained and sent by Grace Community Church (GCC) as a missionary to Mexico City, where he served as a professor at Word of Grace Biblical Seminary (a TMAI school) and as pastor-teacher of Iglesia Cristiana de la Gracia. He has worked in Spanish translation for Grace To You since 1996 and helped translate the MacArthur Study Bible into Spanish. He co-pastors the Spanish-speaking fellowship group at GCC and serves GCC missionaries, with a focus on Ibero-America. He is an adjunct faculty member of TMS in Spanish, SEPE (TMAI Honduras), and Berea (TMAI Spain). He is married to Robin (a TMU alumna), and they have three children—Olivia, Rodrigo, and Ana (current students at TMU).

Matt S. Gilbert

Board Member

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Matt S. Gilbert

Board Member

Matt Sakiestewa Gilbert is Head of American Indian Studies and Professor of History at the University of Arizona. After graduating from The Master’s University in 1999, Matt received an M.A. in theology from Talbot School of Theology, and an M.A. and Ph.D. in history from the University of California, Riverside. He has published extensively on American Indian education and sport. He and his wife Kylene—also a TMU alum—have four children. Matt joined the TMUS board in 2021.

Bryan Hughes

Board Member

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Bryan Hughes

Board Member

Bryan Hughes is the Senior Pastor of Grace Bible Church in Bozeman, MT, where he has served for the past 39 years. He earned his BA from Moody Bible Institute in Chicago, his Master of Arts from Western Seminary in Portland, Oregon and his D.Min from Trinity Theological Seminary in Newburgh, Indiana. Bryan has taught at Bible colleges in Ukraine, Tanzania and Siberia, as well as classes in Albania, Russia, Turkey, Ethiopia, Poland, and Italy. He is the author of 8:28 - Unlocking God’s Promise and Jesus’s Teaching on the Last Days. He presently serves on the faculty of Montana Bible College in Bozeman. Bryan enjoys hunting, reading, and playing basketball. He and his wife, Bev, have three grown children and three grandchildren. Bryan has served on the TMU board since 2000.

Jesse Johnson

Board Member

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Jesse Johnson

Board Member

Jesse Johnson is the Teaching Pastor at Immanuel Bible Church in Northern Virginia. He has his PhD (theology) from Christ College, Sydney. He is a graduate of The University of New Mexico (B.A. in Sociology and Spanish), as well as The Master’s Seminary (ThM in Systematic Theology). Prior to joining the board, Jesse taught theology at The Master’s Seminary, and before that at Christ Baptist Seminary in Polokwane, South Africa. Jesse has been an editor and contributor for numerous publications and books. His most recent book, City of Man, Kingdom of God, examines how Christians should relate to government. He and his wife, Deidre (also a TMU graduate) live with their three daughters in Washington, D.C. Jesse has served on the board since 2015. You can follow his writing at thecripplegate.com.

George Lawson

Board Member

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George Lawson

Board Member

George Lawson is the Teaching Pastor at Baltimore Bible Church. George is a graduate of The Master’s Seminary as well as Washington Bible College. He began his pastoral ministry at Hope Bible Church, in Columbia Maryland, before he and a team planted Baltimore Bible Church. George blogs on thecripplegate.com, and is currently pursuing a Ph. D. program at Baptist Bible Seminary. He and his wife Jennifer have two daughters and one son. George joined the TMUS board in 2021.

John MacArthur

Board Member

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John MacArthur

Board Member

John MacArthur is the pastor of Grace Community Church in Sun Valley, California. He is also chancellor of The Master's University and Seminary, as well as the featured teacher on the Grace to You media ministry.

Matt MacArthur

Board Member

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Matt MacArthur

Board Member

Matt MacArthur is responsible for managing investments at WCM Investment Management. He has been a board member at Grace to You since 2024 and holds the position of Vice-Chairman at the John MacArthur Charitable Trust. Matt is a graduate of The Master's University.

Felix Martin del Campo Jr.

Board Member

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Felix Martin del Campo Jr.

Board Member

Felix Martin del Campo Jr. is a dentist in Visalia, Calif. He attended USC for his undergraduate work and then graduated from the UCLA School of Dentistry. Felix also serves on the board with Samaritan’s Purse and has served for more than four decades with World Medical Missions. Alongside 800 other doctors, he goes around the world to relieve long-term missionaries on furlough. His specialty is designing and setting up state-of-the-art mobile dental clinics. North Korea and Siberia, among other countries, have benefited from such ministries. He enjoys photography in his spare time and has been married to his wife, Janet, for 46 years. Felix has served on the board since 1992.

George Sanders

Board Member

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George Sanders

Board Member

George Sanders practices plastic surgery in Los Angeles. Born and raised in Southeast Texas, George attended Harvard Medical School and then completed his general surgery training and plastic surgery residency at UCLA. George is privileged to have served as an elder at Grace Community Church and taught biblical counseling, the premarital class, and also gave oversight to international missions. George and his wife, Anna, are certified in biblical counseling and often counsel together. In their spare time they love to serve in ministry together as well as travel and entertain. George has served on the board since 2007.

Rod Shackelford

Board Member

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Rod Shackelford

Board Member

Rod Shackelford owns Impact-Ortho (formerly SportsTek Medical), making orthopedic medical devices focused on athletics. He graduated from The Master’s University and Cal State Northridge, where he played basketball. He serves as an elder at Christ Church Central Phoenix. Rod and his wife Elizabeth have five children, four of whom have attended TMU, while the fifth is still aspiring.

Kent Stainback

Board Member

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Kent Stainback

Board Member

Kent Stainback is the CEO of The Stainback Organization, a commercial real estate services firm based in Dallas. He is a graduate of Baylor University in Waco, Texas, and serves as an elder at Trinity Bible Church of Dallas. He joined the board in 2025.

Mark Tatlock

Board Member

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Mark Tatlock

Board Member

Dr. Mark Tatlock is the president and chairman of The Master’s Academy International (TMAI).

Harry Walls

Board Member

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Harry Walls

Board Member

Harry Walls is the Executive Pastor of Stonebridge Bible Church in Brentwood, Tennessee. Prior to that he was the campus pastor for The Master’s University. Harry is a graduate of Brown University, where he played football, and also of Liberty University and Seminary, where he served as campus pastor while preparing for pastoral ministry. Harry was honored with a Doctorate of Divinity degree from The Master's Seminary in 2021. He has served on the TMUS board since 2000. Harry and his wife, Karon, have two children.

Our Leadership

Offices of The Master's Seminary

John MacArthur

Abner Chou

Nathan Busenitz

Mark Zhakevich

Austin Duncan

Jade Greenfield

Corey Williams

Ben Trowbridge

Brian Nkoana

Nathan LeMaster

Board of Directors

Scott Ardavanis

Scott Ardavanis

Board Member

Brad Armstrong

Brad Armstrong

Chairman of the Board

Abner Chou

Abner Chou

Board Member

Peter Coeler

Peter Coeler

Board Member

Luis Contreras

Luis Contreras

Board Member

Matt S. Gilbert

Matt S. Gilbert

Board Member

Bryan Hughes

Bryan Hughes

Board Member

Jesse Johnson

Jesse Johnson

Board Member

George Lawson

George Lawson

Board Member

John MacArthur

John MacArthur

Board Member

Matt MacArthur

Matt MacArthur

Board Member

Felix Martin del Campo Jr.

Felix Martin del Campo Jr.

Board Member

George Sanders

George Sanders

Board Member

Rod Shackelford

Rod Shackelford

Board Member

Kent Stainback

Kent Stainback

Board Member

Mark Tatlock

Mark Tatlock

Board Member

Harry Walls

Harry Walls

Board Member