Hallman earned his bachelor of science in economics at the College of Charleston in 1982 and a master's in business administration at the University of South Carolina in 1985. He began his career as a manager for PGA tour golfers, starting as a marketing consultant for Corey Pavin. Soon tiring of the constant travel, he began looking for an opportunity for a more stable position.
Throughout his career, Hallman has been one of the most prominent voices in favor of building a domed stadium in Birmingham. In December 2017 he was named "CEO of the Year" for companies with 25-50 employees by the Birmingham Business Journal. He was also recognized as the 9th "Most Influential" sports figure in Alabama by the Birmingham News, and he and the Bruno Event Team were named "Tourism Promoter of the Year" by the Alabama Restaurant & Hospitality Association. In 2021 Hallman was honored as "Distinguished American Sportsman" by the Alabama Sports Hall of Fame.
In 2022 Hallman was hospitalized with leptospirosis, a bacterial infection he contracted during a family trip to Costa Rica.
- "Client Spotlight: Gene Hallman" (June 8, 2015) Sirote & Permutt/al.com
- Steere, Tim (May 6, 2016) "Hallman knows the score." Birmingham Business Journal
- Johnson, Roy S. (July 15, 2016) "As Birmingham evolves as a sports town beyond football, will city finally get a dome? An NFL team?." The Birmingham News
- "Ranking the top 25 most influential people in Alabama sports." (August 2, 2017) The Birmingham News
- Rebman, Stephanie (December 8, 2017) "Winners unveiled in BBJ's 2017 CEO Awards." Birmingham Business Journal
- Johnson, Roy S. (August 31, 2022) "Gene Hallman’s trauma inspires ‘godly’ change, doctor’s push for infectious disease specialists" The Birmingham News