Faculty/Staff Directory | IBCS

Meet the People at IBCS

Meet the people who make IBCS what it is. From administrative staff to faculty and residence hall supervisors, we make up the IBCS family.

Nathan M. Mestler, M.Div.
President and Chief Executive Officer, Bible, Theology, Greek
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Pastor Nathan grew up in ministry, first as a pastor’s son in Bernalillo, New Mexico, and then in Nairobi, Kenya, where his family were missionaries. At age 16, he dedicated his life to full-time Christian ministry. He received a B.A. in Bible and Christian Service in 2003 from International Baptist College and Seminary and an M.Div. in 2009 from Calvary Baptist Theological Seminary in Lansdale, Pennsylvania. In 2009, Pastor Nathan and his family returned to Arizona, where he began to work on the staff at International Baptist College and Seminary. He has served as the Dean of Students at IBCS, then as the college pastor at Tri-City Baptist Church. Pastor Nathan also currently serves as the wing chaplain of the 162nd Wing of the Arizona Air National Guard, Tucson, Arizona. He was installed as the president and CEO of IBCS in the spring of 2020 and continues to teach Bible and Biblical languages in both the undergraduate and graduate programs at IBCS. He loves to preach and teach the Word of God, especially to young people.

Kristopher Endean, Ph.D.
Dean of Students; Bible and Christian Service Department Head, Bible, Theology
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Kristopher Endean was born into a pastor’s family in the city of Detroit and grew up two miles from the ocean in the woods of southern Maine. After finishing his college and seminary training in steamy South Carolina, he is delighted that God has led him to serve in sunny Chandler, Arizona, as Dean of Students and Department Head of Bible and Christian Service at IBCS. Dr. Endean has a passion for conservative Biblical scholarship and desires to see that training extended throughout our country and around the globe. In fact, he travels occasionally each year to teach block courses in Bible institutes in foreign countries. When Dr. Endean is not teaching or working in his office, he enjoys hiking, photography, music, and spending time with his wife and five young children.

Marcia Gammon, B.A.
Dean of Women
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Mrs. Marcia Gammon praises the Lord that He graciously saved her soul when she was 17 years old at a secular journalism convention for high schoolers. After a few years she married, had four children, and taught in two Christian schools. As life circumstances changed, she found the need for a Biblically-based degree and received her B.A. from IBCS. She currently serves as Dean of Women and the librarin in the IBCS Media Center. Mrs. Gammon has four grown children and several grandchildren.

Emmanuel Malone, M.Div.
Assistant Seminary Dean, Math, Theology, Pastoral Studies
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Pastor Emmanuel Malone had a passion for engineering as early as age twelve. He graduated with a Bachelor of Science in Electrical Engineering and an M.BA. in Organizational Behavior. He worked in the aerospace industry with GE, NASA, and the Department of Defense. He came to a saving knowledge of Jesus Christ a year after a work relocation to Minneapolis, Minnesota. The Lord called Pastor Malone to serve Him at the peak of his profession. He earned an M.Div. from Calvary Baptist Theological Seminary, in Lansdale, Pennsylvania, and completed the coursework for a Doctorate in Missiology. Pastor Malone was used by the Lord to plant and pastor three churches in Philadelphia and Chicago. After retiring as pastor of All Nations Baptist Church in Minneapolis, he relocated to Arizona to serve on the staff of IBCS.

Eliza Mayoral, B.A.
Financial Aid Administrator
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Mrs. Eliza Mayoral started going to church when she was eight years old after attending VBS. Her brothers and she started going to Sunday school and, eventually, her whole family got involved in the church. She had heard the Gospel many times and understood it but never wanted to put her faith in Christ because she didn’t want to give up her sin and would always tell herself that she would do it tomorrow. At a youth event, the speaker was talking about the brevity of life and how we are not guaranteed tomorrow. The Lord used this message to help Mrs. Mayoral realize that she could not keep pushing salvation off till tomorrow, so at 13 years old, she finally put her trust in Jesus. Both her husband Emilio and she graduated from IBCS. She graduated in 2019 with a Bachelor of Arts Bible and Christian Service: Church Music emphasis. Mrs. Mayoral handles all of the financial aid and billing at IBCS. When she’s not working, she enjoys reading, Microsoft Excel, and spending time with her family and her dog, Moose. She and her husband Emilio recently became first-time parents.

Brittany Moffitt, Ed.D.
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Growing up in a Christian home with six younger siblings, Dr. Brittany Moffitt heard the gospel and accepted Christ at a young age. After surrendering her life to the Lord as a teenager at a Christian camp, she chose to follow God’s leading into full-time vocational ministry. This journey began with earning both her bachelor’s and her master’s in Christian education from IBCS. After working two years as a graduate assistant, Miss Moffitt accepted a full-time position at IBCS in 2020 as Registrar and as the administrative assistant to the Academic Dean. She recently completed an Ed.D. from Liberty University online.

As a native Coloradoan, she loves the mountains and delights in taking others on outdoor adventures, including the annual IBCS Grand Canyon hike. When she is not hiking or working, she enjoys walking, reading, and writing.

Scott Olson, B.A.
Director of Mentoring and Recruitment
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Pastor Scott Olson was raised, discipled, and trained in Arizona at Tri-City Baptist Church. After coming to know the Lord Jesus as his Savior in his youth and growing in his walk of faith, he developed a desire to reach the youth of the West with the Gospel of Jesus Christ. After graduating with a Bachelor of Arts in Christian Service: Church Ministries at IBCS, Pastor Scott, his wife Susan, and their family served in youth ministry at Northwest Valley Baptist Church, where he was ordained as a minister in 1994 and served for 15 years. In 2005 the Olson family moved to California so that Pastor Scott could serve at Ironwood Christian Camp as program director and later as the director of the Ironwood Institute of Ministry and Ministry Bound programs. In 2018 God led Pastor Scott back home to Tri-City Baptist Church to serve as the Director of Mentoring and Recruitment at IBCS.

David Shumate, J.D., Ph.D.
Academic Dean
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Dr. David Shumate came to know the Lord while in Harvard Law School through the witness of a Christian classmate. He felt the call to full-time ministry and, after finishing his law degree, he attended Bob Jones University, earning his M.Div. and Ph.D. degrees and teaching in their School of Religion and Seminary for five years. After 15 years of assistant pastoral experience, he became the general director of Mexican Gospel Mission in 2005 where he served for 17 years. Since 2012 he has ministered at IBCS in various capacities, including adjunct faculty and Seminary Dean. Currently, he draws on this experience while serving as the Academic Dean for both the undergraduate and graduate programs at IBCS.

Rebecca M. Stertzbach, M.C.Ed.
Executive Assistant, Director of Institutional Effectiveness, Language Arts
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Mrs. Rebecca Stertzbach grew up “at camp” in rural southeastern Pennsylvania. A graduate of two Christian colleges, she has a B.S. in English Education from Bob Jones University and an M.C.Ed. from IBCS with an emphasis in ministry and language arts. In her almost 30 years of teaching, she has taught all age groups, from toddlers up through college.

Currently, she serves as the Executive Assistant at International Baptist College and Seminary in Chandler, Arizona, also teaching in the English, speech, and education departments. She has a passion to impart to students the necessity and urgency of clearly communicating the Gospel message.

She has been married for over 25 years to Pastor Dave Stertzbach, Music Pastor at Tri-City Baptist Church, Chandler; they have two married children.


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