Our Staff

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Troy Thomas

Lead Pastor

Office: 262-820-0836
Twitter: @totroyt

Troy Thomas has been serving 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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Aaron Hale

Director of Worship


Mandy Gruchow

Ministry Assistant


Mandy first came to Oakbrook the summer of 2015. She is a stay at home mom, but has loved 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.  

Nancy Holzem

Administrative Assistant


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 your husband and two children.  

Ginney Pearson



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Chris Nolan

Chairman - Council of Elders


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


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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Julie Zeirke

Treasurer - Council of Elders


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