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. 

Email Dr. Gredy


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.

Email James


Gabe Pethtel, M. Ed.

High School / Middle School Principal

Gabe serves as our  Middle School and High School Principal. In his role leading our 6th through 12th grade division, Gabe oversees development and administration of Academic Advising and Life Calling, DCHS Student Government, Special Education, Athletics, and Spiritual Life. 

Since his arrival in 2019, Gabe has implemented a one-to-one technology program in Grades 6-12, introduced a middle school STEM class focused on a Quest for Space through NASA and the International Space Station, and implemented a new hybrid-block schedule that provides longer class periods two days a week for science labs and in-depth study in all subjects.  Accordingly, Dayton Christian was named one of the top schools for STEM in the State of Ohio by Governor Mike DeWine.

Under Gabe’s leadership, the school has expanded its Industrial Arts program and introduced a media broadcasting class that  provides video announcements and livestreaming of school events. In athletics, Gabe also oversaw the re-start of the high school wrestling program and the launch of the bowling team. 

Gabe has a passion to see our school flourish as a premiere Christian school of excellence. He also desires for students and families to deeply know their life’s calling and what it means to have an eternity through Jesus Christ.

Email Gabe


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.

Email Julie

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.