With a principled, precise, and perceptive approach to development, HRC’s Civil Engineers, Landscape Architects and Land Surveyors deliver the high-quality services needed to help public and private developers succeed.

Headquartered in Historic Downtown Douglasville, Ga. since July 2000 and serving clients throughout the Southeast, HRC delivers the site inventory (survey) and analysis, master planning and infrastructure design, construction administration and builder services that help you maximize return.


Howard B. Ray, P.E.
President and CEO

Howard heads the 35+ member team of Civil Engineers, Landscape Architects, Land Surveyors and business services professionals. He inspires them to put client needs first to assure each project is executed with precision. A Civil Engineer, Howard’s headed the business since 2000 with a focus on delivering value. He’s on the boards of Tanner Health, the Carroll County Chamber, Douglas UnitE and the Carroll Symphony, and is also a board member and past chair of the Douglas County Chamber. A Georgia Institute of Technology graduate with a degree in Civil Engineering, Howard mentors STEM students at a local high school.

Darryl D. Ray, R.L.A.
Vice President

Darryl’s a registered Landscape Architect, responsible for planning and design projects for HRC clients. He joined the company in 2005 and leads a group of talented designers from conceptual master planning through project implementation to create the attractive, functional, and sustainable spaces for which HRC is known. Darryl earned two bachelor’s degrees as well as a master’s from Mississippi State and taught at the university’s department of Landscape Architecture.

Aaron M. McCullough, R.L.S.
Vice President

Aaron is a Registered Land Surveyor with more than 20 years of experience in roles of increasing responsibility in the land development arena, and now leads business development at HRC Engineers. He joined the firm in 2007 and since then his priority has been to create productive, long-lasting client relationships through delivery of customized, innovative solutions. Aaron earned a Bachelor of Civil Engineering Technology from Southern Polytechnic State University (now part of Kennesaw State) in Georgia.

Jonathan Tilenis, P.E.
Director of Design

Jonathan joined HRC Engineers in 2015 as an intern—and joined the team full-time a year later. Since then he’s taken on increasing responsibility for client projects, and now serves as Director of Design. He works closely with the firm’s civil engineers, landscape architects and surveyors to deliver the high-quality designs for which HRC is known. He’s a graduate of Kennesaw State University with a degree in Civil Engineering.

Tammy Segura, MBA
Director of Administration & Human Resources

Tammy is Director of Administration & Human Resources, responsible for customer service, human resources, operational processes, and assisting with marketing and budgeting. She has over 25 years of experience as an entrepreneur, Business Consultant, and adjunct faculty at the University of Phoenix. Tammy earned her M.B.A. from the University of La Verne & B.S. from California Lutheran University. Her support of her communities contributed to being named one of Georgia Trend Magazine’s “40 Under 40 Best & Brightest” in 2009.


HRC is committed to doing our part to support the communities where we do business. As a group and as individuals, we contribute our resources to worthwhile organizations that are good for commerce; promote education, the arts, and the environment; and enhance the lives of those nearby, and across the metro-Atlanta area.

Community Is at the Heart of Everything We Do