Our Professionals

Our Professionals

Jack Berry

Owner/Lead Architect

With a solid base of over thirty-five years of training and experience, and a firm belief that an architect is to serve the client (not the architect’s ego); Mr. Berry established the architectural firm, “Jack Berry, Architect” in 1994. Prior to starting his firm, Mr. Berry gained valuable experience working with award winning architectural firms in Boston, MA, Nashua, NH, and Newark, OH.

Since 2001, Mr. Berry has also collaborated with Brown Church Development Group and directed the architectural firms for two design-build companies (Aspen Group and Midwest Church Design) specializing in church design and construction.  Mr. Berry now owns and directs ArchitektOne.

In private practice as well as in other firms, Mr. Berry has designed and managed a wide range of projects including, commercial, financial, industrial, religious, restaurant, retail, residential, and healthcare projects. Because each project has unique requirements, the firm also utilizes talented and highly trained engineers and consultants trained in structural, mechanical and electrical engineering as well as fire protection and other areas. This assures that each discipline is afforded the care it deserves.

Mr. Berry is nationally ceritfied with the National Council or Architectural Accreditation Board (NCARB), along with being a registered architect in Ohio, Michigan, Indiana, Illinois, Kentucky, Pennsylvania, New York, Nebraska, Iowa, South Dakota, Colorado, and Missouri. He also holds professional membership in the American Institute of Architects (AIA), the International Code Council (ICC) and the Christian Architectural Assistance Association (CAAA).

In order to emphasize the unique approach utilized in design and project delivery, the name was changed from “Jack Berry, Architect” to “ArchitektOne” in 2012.

Gavin Haverstick


Gavin Haverstick is the primary  Acoustical Consultant for Haverstick Designs. His degree is in Mechanical Engineering from Colorado State University with a focus in robotics. In his career, Gavin has been involved in the acoustical design/analysis of over 5,000 challenging spaces including recording studios, houses of worship, home theaters, gymnasiums, restaurants, conference rooms, edit suites, museums and industrial facilities. An accomplished musician, Gavin has always had a passion for great music and quality sound. He enjoys collecting vinyl records, going to concerts, traveling, playing basketball/tennis/golf and spending time with his wife, son and daughter.

Gavin has been a featured writer in numerous industry magazines including Mix, Luxury CE, InAVate, Sound & Communications, Technologies for Worship, Religious Product News, Performing Songwriter, EQ, among others. He is often a speaker at events around the country focusing on topics such as Acoustics for Houses of Worship, Recording Studio Design, and Acoustical Testing Methods.

Lincoln VerMeer

Church Banking Team, Cass Commercial Bank

Lincoln VerMeer is vice president for Cass Commercial Bank in Missouri.  He  has an undergraduate degree from the Central University of Iowa majoring in Economics; after which he earned an MBA from Washington University in St. Louis. After a 21-year career of helping privately owned businesses with their banking needs, Lincoln joined the Cass Commercial Bank “church banking team” in 2008. There he specialized in helping churches and ministries with their banking needs, including, loans (construction loans, term loans and refinancing); deposits (insured to $50,000,000), electronic giving platforms and credit cards.

Lincoln is very committed to helping churches, with roughly 46% of his team’s current loan portfolio assigned to churches and ministry clients. Typical loans sizes range from $1,000,000 to $10,000,000 (with the ability to go higher). Lincoln and Cass Bank have church clients in over 30 states.

Oscar Otero


Oscar graduated from Purdue University in 2019 with a degree in Acoustical Engineering. While at Purdue, Oscar received a Theatre Design & Production Minor, performed in Heart & Soul Gospel Choir, and served as President of Purdue’s chapter of the Acoustical Society of America. Having interned at Haverstick Designs for two years during college, Oscar is excited to join as a full-time consultant and looks forward to contributing to the team! True to his Colombian heritage, Oscar enjoys playing soccer, making/listening to music, dancing, spending time with his family, and eating great food.