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Embracing God | Growing People | Experiencing Revival | Pursuing Reconciliation

About us

Oasis City Church is a vibrant multicultural and multigenerational congregation located in Central Ohio. Founded by Apostle Bill Themelaras, Pastor Lynne Themelaras, and Pastors Adam and Tara Stewart, the church is known for its anointed worship, prophetic ministry, and powerful teaching. Oasis City Church is dedicated to Embracing God, Growing People, Experiencing Revival and Pursuing Reconciliation

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Core values

Our core values are the underlying principles that guide us in making decisions, determining priorities, setting goals, allocating resources.

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Revival stories

Revival Stories are stories of transformation, a change in the way you think or a moment when God was so present you have to tell people about it. Check out just a few of the many Revival Stories from right here at Oasis City Church. Then consider sharing your own below.
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Pastors

Bill & Lynne Themelaras

Senior Leader / Restore Pastor
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Adam & Tara Stewart

Campus Pastor/ Worship & Fine Arts Pastor
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Tammy Botkin

Executive Pastor

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Jake & Pam Lozano

Associate Pastor / Prayer & Prophetic Pastor

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Arthur Green

Youth Pastor

Alec & Hope Ballentine

Children’s Pastors

Meet the Whole Team

Oasis City Church - Eastwind Campus

975 Eastwind Drive, Suite 190, Westerville, OH 43081

Oasis City Church- North Spring Campus

425 N Spring Rd Westerville, Ohio 43082

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Bill & Lynne Themelaras

Senior Leader | Restore Pastor

Bill and Lynne Themelaras were high school sweethearts who married after college and soon began the adventure of full-time ministry. Now, twenty-six years later, they live in Westerville, OH with their three amazing children and the family dog. Bill serves the greater church as a prophetic apostle. He serves as Senior Leader for both Oasis City Church, Westerville, OH and Covenant Church of Pittsburgh, in Pittsburgh, PA.

Bill is gifted as an organizational leader with a heart to raise up team ministry within the church. Bill has a passion for worship, preaching and ministering to people. He enjoys movies, the Pittsburgh Steelers, and is a “foodie”.

Bill also serves as the President of Reconciliation! Ministries International, a network of five-fold ministries participating in the revival, renewal, restoration, and reformation of the church. This network is founded and chaired by Bishop Joseph Garlington, Sr.

Lynne has a Masters Degree in Psychology. She is the Restore Pastor overseeing several ministry areas including Restore, the inner healing ministries of Oasis City Church and Covenant Church of Pittsburgh. She enjoys health and fitness, reading, and Starbucks coffee.

Together Bill and Lynne desire to see lives transformed and to help people embrace their God-created identity.

Adam & Tara Stewart

Campus Pastor | Worship & Fine Arts Pastor

Adam and Tara’s journey began after Adam’s heart skipped a beat when he first heard Tara sing at the Brownsville Revival School of Ministry in Pensacola, Florida. They married shortly after graduation and began full-time ministry.

While serving as Youth Pastors at Covenant Church of Pittsburgh for 8 years they met Bill and Lynne Themelaras. With the guidance of Holy Spirit the four of them were called to Westerville, Ohio to plant Oasis City Church together.

As the Campus Pastor, Adam loves to lead people in finding their God-given purpose. His passion for leading and mentoring has been a foundational part of his ministry at Oasis City Church.

Tara is a passionate lover of Jesus and prophetic worshiper. She serves as Worship Pastor and loves leading people into authentic encounters with God.

They reside in Galena, OH where you will find Adam with their two boys playing sports, Tara shopping at the Outlet Mall with their daughter or enjoying family time with the newest member of the family, an active bichon named Biggie Smalls.

Tammy Botkin

Executive Pastor

Tammy Botkin and her husband Brian reside in Delaware, along with their two children. With 25 years of experience in worship leading, pastoring, and discipling, Tammy has spent decades pointing people toward God and nurturing worship environments where He is genuinely pursued. A lifelong creative, Tammy has spent more than 20 years as a musician, songwriter, and recording/performing artist and focused community worship efforts in her work at the Worship Arts Center of Columbus. 

Deeply committed to community, Tammy has spent years connecting worship leaders and ministries across the city, believing that collaboration multiplies Kingdom impact. Her 10 years as a consultant have allowed her to work with countless leaders and teams, helping them push beyond surface-level ministry and embrace intentional, sustainable growth. 

Tammy leans on her background in operations management and sales, where she developed strengths in staff training and HR, organizational systems, quality assurance, and long-term team health. She loves seeing people thrive in roles aligned with their skills—and watching ministries function and honor the Lord with joy, unity, and excellence.

You will most likely find Tammy with an iced tea in hand and discussing her love of donuts and bluegrass music. 

Jake & Pam Lozano

Associate Pastor | Prayer & Prophetic Pastor

Jake and Pam Lozano grew up in two very different worlds – Jake from the Washington DC/Maryland area and Pam from a small town outside of Cleveland, Ohio. They met at a church conference at the Indiana University of Pennsylvania and began dating shortly after. Jake soon relocated to Cleveland, Ohio where the two of them were married and served together in youth ministry for ten years.

In 2007, God led the Lozano’s to Columbus, OH where they continued to serve youth and young adults for several years. Through a God-ordained transition, God brought Jake and Pam and their three amazing kids to Oasis City Church where they now serve together.

Jake has a passion for evangelism and reaching the lost. He has a passion to help church get “outside the four walls” of the building into the community. In his spare time, Jake enjoys golf, watching sports, playing drums and riding his Vespa.

Pam has a deep desire to encounter God and bring heaven to earth through prayer & intercession. When she isn’t working, she enjoys writing, decorating homes and a Starbucks peppermint hot chocolate with friends.

Together, Jake and Pam desire to see the next generation empowered to passionately know and love Jesus, and for the church to encounter God radically.

New Service Times

8:15am

THE LIGHT EDITION
This NEW service is a 1-hour, family-friendly, with reduced sound and lighting, and with all the OC essentials of worship, teaching, and ministry – just abbreviated.

Children will worship with their parents, and then go to their rooms for age-focused Bible teaching and ministry.

9:30am & 11:30am

THE REGULAR EDITION
These services will feature everything you already know and love about Sundays at the OC, with all the OC essentials of worship, teaching, and ministry

OC Kids & middle school programing will be available for both services