Pastoral Leadership


Senior Pastor


Bob Kosbau was born and raised in Gilbert, IA, a small town that has now become a “suburb” of Ames. As God called him to ministry, his passion has been bringing the Gospel of God’s grace to people of the rural Midwest. His desire is to see people grounded in the Truth of God’s Word and sent out as multiplying disciples of Jesus Christ. After graduating from U.N.I. (BA), he received biblical training at Moody Bible Institute and then graduated from Dallas Theological Seminary (ThM).  He has pastored the Evangelical Free Church of Marshalltown since 1991.  He and his wife, Jenny, were married in 1985 and share a deep passion for relational connection with people of all cultures and backgrounds. They have three grown children: Sam, Ben and Lydia, who is married to Reid Youngdahl. Bob enjoys a good cup of coffee and almost any sports activity.

Associate Pastor


Brent Thiessen was born and raised in Hays, Kansas.  He lived there until his family moved to Marshalltown in 1984 when he was in the sixth grade.  Brent graduated from Marshalltown High School in 1991 and married his high school sweetheart, Wendy Schoell, in 1996 after graduating from the University of Iowa.  They are now parents of three boys: Lucas, Elijah, and Jacob.

Brent was called into the ministry in 2002 and served as a volunteer in the children’s and youth programs of Marshalltown’s First Presbyterian Church until 2011.   That February, God called Brent to serve as the Associate Pastor of Children’s Ministries at the Evangelical Free Church of Marshalltown.  His passion for sharing the Gospel and seeing families lead in the discipleship of their children is what drives his ministry at E Free.  Brent attempts to resource parents who wish to disciple their children at home and prays that his ministry reinforces their efforts.  Brent graduated from the University of Iowa with a B.A. in English, with a secondary education certification.  He is currently completing a Master’s degree in Biblical Exposition.  When Brent is not at the church, he loves spending time with his wife, attending their older two boys various music concerts and their youngest’s many sporting events.

Associate Pastor

Scott Byers grew up in Forest City, Iowa, and graduated from Moody Bible Institute with a degree in Bible & Youth Ministry. While attending NIACC in 2009, he met Nora, the beautiful young lady who would become his bride in 2012. After spending the summer in Jerusalem, Scott & Nora joined Marshalltown E-Free in the Fall of 2014. God has used Scott’s experiences living in Europe and the Middle East to deepen his love both for the local church and the body of Christ worldwide. His heart for youth ministry is to see young people and families transformed by the gospel of Jesus Christ. His prayer is for God to raise up a generation of servants who love Christ with all their heart, soul, mind and strength, and who radiate the gospel by loving neighbors as themselves. Pastor Scott loves spending time with Nora, traveling, reading, coffee, basketball, Chicago, the Hawks, cookie dough ice cream, and anything with BBQ! Scott and Nora welcomed their first child, Judah John, in April of this year!