This document discusses the roles of Chief Information Officers (CIOs) and Chief Marketing Officers (CMOs) in digital business transformation. It provides perspectives from various CIOs and CMOs on how the two roles need to work together more collaboratively given the growing importance of digital technologies. Specifically, it notes that CMOs will see the greatest IT-driven business transformation and that CIOs and CMOs need to partner to leverage big data and analytics effectively. The document advocates that CIOs understand marketing requirements and help enable marketing teams through technology.