Our Team

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Troy Thomas

Lead Pastor

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Office: 262-820-0836

Troy Thomas has been serving as the Lead Pastor at Oakbrook Church since October 2015. He is passionate about seeing ordinary people come alive in Christ. Troy grew up in Cedarburg, Wisconsin and went to college on a football scholarship. After a short stint with the Washington Redskins, Troy married Liz, his high school sweetheart and got a “real” job working with technology and then as a management consultant before becoming a pastor.

Troy committed his life to Jesus Christ as a young man when he “accidently” responded to an altar call at a Fellowship of Christian Athletes meeting. Since that decision, Troy’s life hasn’t been challenge-free or failure-exempt. But since then, Troy has definitely known a peace that passes his own understanding.

Troy has a bachelor’s degree from Northern Iowa, an MBA from George Washington University, a Masters in Christian Studies from Trinity Evangelical Divinity School, and is currently doing graduate studies at Rockbridge Seminary. Troy and Liz are parents to three young adults. Troy is an aspiring fly fisherman and leads groups to Israel every year.

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Jon Tajnai

Worship Leader

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Jon Tajnai and his family have been regular Oakbrook attenders for 2 years now. As the Worship Leader, Jon is focused on leading people into a culture that allows them to worship freely with heart abandoned. He is passionate about developing the Oakbrook worship team and serving the Oakbrook family.

Jon lives in the Brookfield area with his wife Kelsea and their children Jack and Marni. They are also expecting another child in January 2018! He enjoys sports, family time, and music.

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Mandy Gruchow

Ministry Assistant

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Mandy first came to Oakbrook the summer of 2015. She is a stay at home mom, but loves her part-time job as ministry assistant at Oakbrook. She is an active volunteer at her children's school, loves exploring new places, and is an avid reader. Mandy lives in Menomonee Falls with her husband and two young children.  

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Nancy Holzem

Administrative Assistant

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Nancy first learned about Oakbrook through the MOPS group in September of 2007. During MOPS, Nancy joined the steering team where she organized crafts and later joined the hospitality team. In 2013, after learning about the job opening from a former MOPS mentor, Nancy joined the Oakbrook staff as the Administrative Assistant and temporary Bookkeeper. She enjoys spending time with her family and doing crafts. Nancy lives in Sussex with her husband and two children.  

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Ginney Pearson


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Ginney joined the Oakbrook staff in June 2014. She is responsible for all the accounting and financial records for the church. Ginney lives in Sussex and enjoys computers, technology, reading, spending time with friends, nature and various crafts. 

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Julie Zeirke

Treasurer - Council of Elders

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Julie and her husband, Jim, have been attending Oakbrook Church since March of 2010. Julie is on the elder board and leader of the prayer ministry. She also leads the Frontline prayer group that meets on the 2nd and 4th Tuesday of the month and coordinates the summer neighborhood walks.

Julie retired after a 36-year career as an Office Manager/Accountant at Curtiss-Wright Corp. in northwest Milwaukee. She enjoys reading and has recently started trying her hands at photography. Julie and Jim also like to travel. Her words of encouragement to all who ask; never be discouraged by small beginnings!

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Julie Hammel

Secretary - Council of Elders

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Julie attended Oakbrook's first service in 2007. She loves serving God, family, church & her community. Julie greets everyone with a smile - she chooses JOY and loves HUGS.  Julie and her husband were married for almost 31 years before his passing in 2002. They have one son, Alex, who is married to Iris.  Julie has worked for State Farm for 30 years.

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Ethan Radtke

Worship Intern

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Ethan began attending Oakbrook in the winter of 2016.  Ethan studies Audio Production at Milwaukee Area Technical College, and is passionate about everything audio related. He began serving as a Worship Intern at Oakbrook in December of 2017. He supports all aspects of technical production during worship gatherings. He loves going to concerts and spending time  playing/writing/recording music. Ethan also enjoys hiking and spending time outdoors with his friends. 

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Chris Nolan

Chairman - Council of Elders

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Chris and his family have been attending Oakbrook since 2010. Chris was called to serve as an elder in 2014 and is currently chair of the elder board. When Chris isn't serving at Oakbrook he is serving as a branch claim manager at American Family Insurance. In his free time Chris enjoys cycling, running, working out and traveling. He lives in Sussex with his wife and two kids. 

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Brian Hammersmith

Vice Chairman - Council of Elders

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Brian first came to Oakbrook in the summer of 2007. He currently serves as Vice Chair Council of Elders, nursery helper, assists with maintenance duties at the church and is always there to help out when needed. Brian has been in the metal fabrication industry for 41 years and is currently an Industrial Maintenance Supervisor. Brian is married to Karen and has one stepdaughter and two granddaughters. 

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Scott Dawley

New Life Resources Counselor

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Office: 262-782-1474

New Life Resources is pleased to provide local mental health counseling services to our church and nearby communities. Scott Dawley (M.A., M.S., LPC-IT), a licensed counselor at New Life Resources and a member of Oakbrook, is available for private counseling appointments at Oakbrook’s church offices.

Scott desires to help clients live authentic lives with meaning, purpose and hope. Using an integrative approach to mind, body and soul and meaningful connections with themselves, God and others, clients experience greater emotional, relational and spiritual well-being. 

Practice Focus
  • Individual, couples and group counseling
  • Sexual and gambling addiction
  • Depression and Anxiety struggles
  • Spiritual integration and wholeness
  • Parenting 
  • Adjustment issues
  • Stress management
  • Life transitions and existential struggles

M.S.  Counseling from Concordia University-Wisconsin
M.A.  Christian Studies from Trinity International University

To schedule an appointment with Scott at the Oakbrook Church offices in Sussex, contact New Life Resources at 262-782-1474

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Frank Thomas

Director of Security

Frank has been coming to the Oakbrook office on a regular basis since 2015. He has no pedigree and sleeps most of the time. Occasionally Frank enjoys wandering around looking out for Pastor Troy and anyone else who stops in. In his spare time, Frank hangs out next door at Kim's Canine Design.