Digital transformation at 165-year-old health insurance company Aetna doesn't happen overnight. But CMO David Edelman facilitates growth and transformation at the company by applying iterative, agile principles to evolve workflows and foster constant collaboration between teams. Edelman spoke with eMarketer’s Jillian Ryan about why and how he updated marketing processes to move the company forward as part of eMarketer’s May report, "The Modern Marketing Department 2018: Evolution Through Digital Transformation."