The advent of digital health devices and mobile health apps has the potential to improve care, change patient behavior, and permit doctors to intervene early when the health of a patient changes. But the American Medical Association wants to ensure that as these devices proliferate, doctors have a role in guiding their design and determining their worth. We spoke to James Madara, CEO of the AMA, about new principles its adopted to promote safe and effective mHealth applications, the concerns physicians have about the use of these apps, and how he sees them reshaping healthcare.