In 1994, Banner began his work in professional football when Jeffrey Lurie, an old friend, purchased the Eagles. He was promoted in 1996 to senior vice president, and in 1997 from senior vice president of administration to executive vice president. In 2006, his contract was extended through 2010. On April 1, 2010, his contract was extended three more years through 2013. He changed positions on June 7, 2012, becoming the strategic adviser to team owner Lurie. Don Smolenski replaced Banner as president.
In 2001, Banner received a "PARTNERS Leadership Award" from the University of Pennsylvania for his extensive community service, including volunteer activities reading to students in the Boston public schools and spending time with severely ill children in the Boston Children's Hospital. He has also been heavily involved, in both Boston and Philadelphia, with City Year, a program based on volunteers who commit to a year of full-time volunteer work.
Banner was the only non-league office member intimately involved in the 2011 CBA Negotiations on behalf of the owners. This resulted in a decade of labor peace and significant growth for the NFL.
In 2012, Banner was reportedly part of a group that was interested in purchasing the Cleveland Browns. On October 16, 2012, Banner was announced as the new CEO of the Cleveland Browns by new owner Jimmy Haslam. On February 11, 2014, the Cleveland Browns announced that Banner would be leaving the Browns by the following summer and leave a transition to the new management team which he had hired.
On December 24, 2014, Banner was hired as a consultant with the Atlanta Falcons.
In addition to his other accomplishments, Banner may be best known for his ability to identify and develop young talent,[5] as evidenced by NBA team presidents Scott O'Neil and Len Komoroski and NFL team presidents Mark Donovan and Don Smolenski. Prior to hiring Andy Reid, he hired then future head coaches John Harbaugh, Jon Gruden, Sean McDermott, and Sean Payton. He also hired Andy Reid as head coach of the Eagles prior to Reid ever serving as a coordinator. With Reid, he collaborated on hires of Brad Childress, Matt Nagy, Doug Pederson, Steve Spagnuolo, Marty Mornhinweg, and Pat Shurmur. In the Front Office, he hired numerous eventual GMs in Brett Veach, Ryan Grigson, Tom Heckert, Jason Licht, and Howie Roseman.