Walter E. (Bert) Nunn, III is the company's Vice President of Operations. Although his responsibilities include the day-to-day management of the company's operations, he is also heavily involved in the technical sales and service of the company's products. Bert holds a BS degree in business management with an emphasis on marketing from Winthrop University.

John E. (Tray) Matthews is Technical Sales and Service Representative for the company and has primary responsibility in ash marketing and transportation for the southern portion of South Carolina and Georgia. He has over 15 years experience in the production and quality control of ready-mix and concrete block. Tray is a Certified Concrete Technologist and has been with The SEFA Group since December 1997.

Gary W. Sheaff is Technical Sales and Service Representative for the company and has primary responsibility in ash marketing and transportation for the state of North Carolina and coastal South Carolina. He has over 20 years experience in the chemical admixture and fly ash industry. He is ACI Level One certified and has been with The SEFA Group since December 1997. He currently serves on the Board of Directors of the Carolina Ready Mix Concrete Association.

Mark D. Casey is Technical Sales and Service Representative for the company and has primary responsibility in ash marketing and transportation for the eastern portion of Tennessee and northern Georgia. Prior to joining the company in March 2001, he was employed in the food services management industry. He has an AAS management degree from Walker State Community College in Morristown, TN.

Clark Gates is Technical Sales and Service Representative for the company and has primary responsibility for ash marketing for the western Tennessee and northern Mississippi.  Clark has over nine years experience in the aggregate, cement, and concrete related industries with excellent communication, presentation, and management skills. Clark has Concrete Technology Degree from Alpena Community College located in Alpena, Michigan and a Bachelor of Business Administration from Montreat College located in Montreat, North Carolina. He is certified in the following: ACI level One Field Grade Technician; ACI Concrete Flatwork Technician; PCA masonry levels I and II; NRMCA levels I and II as well as various DOT certification courses.  He lives in the Nashville, Tennessee area and coordinates with Bryan Strevel the sales and marketing efforts for our Cumberland Fossil Plant located in Cumberland City, Tennessee. 

Hank Keiper is Technical Sales and Service Representative for the company. His primary responsibility is ash marketing in Virginia and Maryland. He has more than 20 years experience in engineering, construction management, ready-mix concrete production and concrete quality control. He holds an ACI Level One Certification, NRMCA Certified Concrete Technologist, Virginia DOT Hydraulic Concrete Cement Certification and a Professional Engineer's license. Hank graduated from the US Air Force Academy with a BS degree in Civil Engineering.

Bill Black is Technical Sales and Service Representative for the company in Charlotte, NC.

Thomas Wahl is Technical Sales and Service Representative for the company in Roanoke, VA.