Organization
Management Profiles
Acting Director:
Ron Adderley
Ron.Adderley@GwinnettCounty.com
Ron Adderley became the Acting Director of Support Services in September 2023, after serving as the Deputy Director since October 2021. Ron was previously the Fleet Management Division Director, where he managed the purchase and maintenance of approximately 3,000 vehicles and equipment; fuel delivery of over 5,000,000 gallons per year at 11 fuel sites; and surplus vehicles, equipment, and other items totaling more than $1,000,000 per year.
Ron previously served as the Field Operations Manager and Capital Improvement Program Manager for the city of Centennial, Colorado, and as the Field Services Manager for the city of Sandy Springs while with CH2M HILL. Prior to that, he was the Construction and Maintenance Division Manager for the city of Roswell Transportation Department and was a Construction Project Manager with the Georgia Department of Transportation. He also served as an original member and supervisor of GDOT’s H.E.R.O. program in metro Atlanta.
Ron and his wife, Jane’t, have one daughter.
Deputy Director:
David Mogge
David.Mogge@GwinnettCounty.com
David Mogge became the Deputy Director in February 2021. David was previously the Facility Construction Division Director. In this role, David managed a team responsible for design and construction of new general government facilities such as fire stations, police stations, and libraries; capital maintenance projects such as roof replacements, HVAC replacements and upgrades, and plumbing upgrades; and major facility renovations. Dave began his career with Gwinnett County in 2013 as an Engineering Coordinator in the Support Services Department. He also serves on the Gwinnett County Environmental Sustainability Committee.
Prior to joining Gwinnett County, Dave served as a project engineer with the U.S. Army Corps of Engineers. He started his career as a Civil Engineering Officer in the United States Air Force and remains active in the United States Air Force Reserve as a commissioned officer.
Dave is a professional engineer and a certified energy manager, and he earned both Master of Engineering and Bachelor of Science in Civil Engineering degrees from the University of Florida.
Dave and his wife, Adrienne, have two sons.
Business Services Division Director:
Susan Paul
Susan Paul became Fiscal and Solid Waste Management Division Director in March 2019. In this role, Susan provided financial management support for the Department’s budget, contracts, fixed assets, procurement, billing and receivables, and administers the County’s Solid Waste Program. In 2022, she became Director of Business Services to focus primarily on process improvement, financial management, and training for the Department of Support Services.
Susan began her career with Gwinnett County in 2003 in the Department of Financial Services. Since that time, she has held a variety of positions within the Finance Department. Most recently, she served as a Project Coordinator in the Office of Strategy and Performance Management. Prior to joining Gwinnett County, Susan was a public service faculty member with the University of Georgia.
Susan earned a Master’s in Public Administration from the University of Georgia and a Bachelor's of Arts in Economics from Randolph-Macon Woman’s College in Lynchburg, Virginia. Susan has secured both Level I and Level II Finance Officer Certifications from the University of Georgia. Additionally, she has obtained the designation of Certified Public Finance Officer from the Government Finance Officers Association.
Facility Construction Division Director:
Jerry Dennis
Jerry.Dennis@GwinnettCounty.com
Jerry Dennis joined Gwinnett County in May 2023 as a Program Manager with the Facility Construction Division. His primary responsibilities included managing the planning and construction of large-scale capital projects. Jerry became the Facility Construction Division Director in August 2024.
Prior to joining Gwinnett County, Jerry worked for over 23 years with various architecture and engineering firms and is a licensed Architect specializing in the planning, programming, design, and delivery of a variety of public building projects to include law enforcement facilities, administration buildings, courthouses, public safety facilities, and other specialized and complex government and municipal projects.
Jerry earned a Bachelor of Architecture degree from Auburn University, holds a certification with the National Council of Architectural Registration Boards, and holds a Building Design + Construction professional accreditation with the United States Green Building Council’s Leadership in Energy and Environmental Design Program.
Outside of work, Jerry enjoys spending time with his wife, traveling, and fishing.
Fleet Management Division Director:
Brinston Williams
Brinston.Williams@GwinnettCounty.com
Brinston Williams joined Gwinnett County in May 2024 after serving as Fleet Manager for Gwinnett County Public Schools (GCPS) where he managed a fleet of over 2600 vehicles. GCPS operates the largest school district owned and operated school bus fleet in the United States. In addition to many other projects and responsibilities, Brinston managed the screening, interviewing, and onboarding of all 94 Fleet staffers including mechanics, parts clerks, and administrators.
Prior to joining Gwinnett County and GCPS, Brinston worked for over 20 years for Original Equipment Manufacturers such as Kubota Tractor, Doosan Infracore, and Sandvik Mining and Construction. During his time there, he was responsible for product support management, warranty analytics/reimbursement, and various sales support roles. He’s held responsibilities in finance, sales, and technical support for multiple product lines. He earned his Bachelor of Science degree from California Polytechnic State University in Agriculture Engineering Technology and a Master of Business Administration from the University of Phoenix.
Outside of work, Brinston enjoys traveling with his wife of 24 years and off-road motorcycle riding. They have a son and daughter both attending SEC universities.
Operations and Maintenance Division Director:
Zac Churney
Zachary.Churney@GwinnettCounty.com
Zac Churney became the Operations and Maintenance Division Director in February 2022. Zac began his career with Gwinnett in 2018 as an Engineer IV, where he managed a team responsible for the daily operations of the mechanical, electrical, low voltage, and plumbing systems at Gwinnett’s libraries, courthouses, OneStop locations, and other County facilities. Prior to joining Gwinnett, Zac worked as a project and sales engineer with a multifamily HVAC contractor.
Zac earned a Bachelor of Science in Mechanical Engineering from the Georgia Institute of Technology. While at Georgia Tech, he was part of a team that developed a stroller capable of going up stairs. The team was a finalist at the 2014 InVenture prize. Zac is also a member of the American Society of Mechanical Engineers.
Outside of work, Zac enjoys watching sports and golfing.
Real Estate and Records Management Division Director:
Clyde Shackleford
Clyde.Shackleford@GwinnettCounty.com
Clyde Shackleford became the Real Estate and Records Management Division Director in October 2020. In this role, Clyde provides management functions related to County owned real estate, records retention and disposal, County mail services, and food service contracts.
Clyde began his career with Gwinnett County in 2012 as a Real Estate Specialist in the Support Services Department. Since then, he served with the Planning and Development Department as a Planner and as the Real Estate Section Manager in Support Services. Prior to joining Gwinnett County, Clyde held positions in land surveying, geographic information system applications, and as a real estate associate broker.
Clyde earned a Bachelor of Arts in Political Science from Virginia Tech and a Certificate in Local Government Management from the University of Georgia. He is also a licensed Real Estate Broker in Georgia and Virginia, a licensed Real Estate Appraiser in Georgia, and a certified Right-of-Way Agent through the International Right-of-Way Association.
