Cullen comes from four generations of Texans and has worked around his family's agriculture and construction business since age 5 driving his great uncle around in the ranch pickup. He designed and remodeled his church's front yard at 17 for his Eagle Scout, attended UNC-Chapel Hill at age 19, and joined an investment bank at age 22 where he advised building products companies on mergers and acquisitions and built relationship development, financing and management skills for running a construction company.  He founded ETS at 25 to provide masterplanning, project management, and construction services to residential and commercial clients in Texas. Cullen is a religious gym goer and a decent hunter.