Cox then went on to have a successful career in the food service industry where he designed, engineered, and sold ventilation hood systems to chain restaurants on a global scale for over two decades. Cox has also been involved in remediation work for the state and real estate acquisitions. Now, he serves as the President of Simple Mission in Cumming, a company that serves as a manufacturer's representative in the food service industry.

Additionally, he has spent twelve years as a football coach in Forsyth and Dawson County at both the high school and middle school levels. From 2015-2020, he was the Defensive Coordinator at Dawson County High School, where the program won 48 games with only 23 loses. This included one region championship, one Elite 8 appearance, four Sweet 16 appearances, and twelve playoff games. He also coached at Lambert High School / Riverwatch Middle School (feeder school for Lambert) and Kings Ridge Christian School. While at Lambert High School, Cox also worked as a certified math teacher.

​ Brent and his wife Tonya have been married since 1993. Together, they have three children (Anson, Wesley, and Lydia), one daughter-in-law (Teresa), and one grandchild (Hannah). Brent and Tonya attend Free Chapel Church in Gainesville.