Leadership Team

John Gredy, Head of School, Ed. D.

Dr. Gredy began his tenure as Head of School in 2016. Before coming to DC, he served as Vice-President for Enrollment Management and Marketing at Cedarville University, Indian Wesleyan University, and Trinity International University. In addition, he was the Executive Vice-President for Strategic Growth at Cedarville University and also its Provost. Dr. Gredy also has experience at the elementary and secondary level serving as the Chairman of the Board of Westlake Christian Academy in Chicago, and he previously acted as the Director of Development and Community Relations for Dayton Christian School.

Gredy has been the driving force behind the momentum occurring at Dayton Christian School. The school has experienced tremendous enrollment growth, recorded high satisfaction with parents, and enjoyed successful facilities growth with the addition of the Warrior Center (including the Darrell and Gloria Patrick Lobby and the Warrior Center entrance), the PreK-K renovation and expansion, and a new playground. Gredy encourages proactive master campus planning and strategic planning to ensure that Dayton Christian School’s mission will endure for years to come.

Gredy’s vision for DC is that it would continue to flourish as a school known for its loving environment, strong academics, and foundation of truth that prepares its students for the future both academically and spiritually. 

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James Holliday, M. Ed., Elementary Principal

James has served as DC Elementary Principal since 2019 and was originally tasked with increasing enrollment in Grades PreK-5, continuing to strengthen academic programs, and retaining and building upon our outstanding faculty base. 

James implemented the administration of the NWEA assessment and OST to all students in kindergarten through fifth grade, which provides data that allows the school to compare itself with others within the state as well as nationwide. Currently, our elementary students are scoring above national and state averages in most grades and subjects for both assessments. 

During his tenure, new programs, such as Spanish, MakerSpace STEM classes, and cooking have been added to the curriculum.  The elementary school now provides enhanced special education services, including a reading specialist for struggling learners. James has overseen the hiring of diverse candidates in multiple roles within DCES, developed an elementary leadership team, and installed department heads for every subject. Since he assumed the position of elementary principal, enrollment growth has increased by 68%.

He has accomplished a great deal in a short amount of time, but for James, the most exciting thing about being DC Elementary Principal is seeing students come to faith in Jesus Christ.

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Darren Gentry, MS Ed.

High School Principal

Darren comes to us from International Community Schools (ICS) in Bangkok, Thailand, where he served as a high school social studies teacher for four years before being promoted to secondary principal and ultimately superintendent, a position he held for the past 16 years.  He will assume the role of high school principal at Dayton Christian School on July 1, 2022.  

Darren received a Bachelor of Arts in psychology from Mt. Vernon Nazarene University and a Master’s of Science in teaching secondary social studies from SUNY Brockport. He holds several key credentials, including a Lifetime ACSI Superintendent and Secondary Social Studies licensure. He also holds a five-year professional educator licensure in the State of Ohio and is a credentialed evaluator of the Ohio Teacher Evaluation System (OTES). 

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Lydia Gaddis, SHRM-CP, PHR, pHCLE

Chief Operations Officer

Lydia joined DC assumed the role of Chief Operations Officer in 2021. As COO, Lydia is responsible for multiple areas within the school including human resources, payroll, transportation, and food service.

Lydia holds a Bachelor of Science in Public Administration from Cedarville University, and a Master of Business Administration from the University of Phoenix. She previously served as Director of Human Resources for Springfield City School District, and Associate Vice President of Human Resources at Cedarville University. 

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Tim Johnson, CPA, MBA, Chief Financial Officer

Tim joined the DC family in 2021. He holds a Bachelor of Science in Accounting from Wright State University and a Master of Business Administration from the University of Dayton. 

Tim previously served 15 years as the controller for the Community Blood Center/Community Tissue Center  and 18 years in finance at Huffy Corporation. 

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Julie Thompson

Chief Enrollment Management & Marketing Officer

Julie arrived at DC two years ago in order to help lead the marketing efforts for the Warrior Center project. Julie brings nearly 20 years of experience in marketing and public relations – a skill she continues to provide to organizations in our community.

As lead over admissions, marketing and communications, Julie is responsible for creating a culture of growth throughout the entire institution. She guides efforts aimed at recruiting and retaining strong partner families, and expanding the awareness of DC throughout Greater Dayton. Her team’s work is already paying dividends as we enjoy one of our higher retention rates and healthiest enrollment increases in recent years.

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Krystal Cox, MA

Chief Administrative Officer

Krystal, a ten-year DC veteran, has held numerous positions in the school including Associate Director of Homeschool, Payroll Specialist, and Assistant to the Head of School.  She is currently pursuing her doctorate in strategic leadership in addition to serving as Dayton Christian’s CAO.

As Chief Administrative Officer, Krystal oversees all reporting, certification, and accreditation through the Association of Christian Schools International and/or the Ohio Department of Education.  She heads up the Advancement Office and acts as liaison to the Dayton Christian School Board of Trustees and the DC Leadership Cabinet.  In addition, she has a pivotal role in cultivating the church partnerships Dayton Christian maintains in the Miami Valley.