Lynn served as the Chairman of Cummins, an engine corporation, from 1999 to 2011. He returned to the fast food industry, serving as the Chief Executive Officer of Back Yard Burgers from 2007 to 2010. In 2012, he founded RP3, a merger & acquisition firm in the fast food industry. He serves as its Managing Partner. He also serves on the Board of Directors of Krispy Kreme.