The most significant health and wellness challenges increasingly involve chronic conditions, from diabetes, hypertension, and asthma to depression, chronic-pain, sleep and neurological disorders. And three lifestyle behaviors contribute to many of these conditions. Participatory mobile health (mHealth) leverages the power and ubiquity of mobile and cloud technologies to assist individuals, clinicians, and researchers in monitoring, managing, and understanding symptoms, side effects and treatment outside the clinical setting; and to address the lifestyle factors that can bring on or exacerbate these conditions. By empowering individuals to track and manage their key health-related behaviors and outcomes, this approach has the potential to greatly improve people’s health and quality of life, while simultaneously reducing societies’ overall healthcare costs. Participatory mHealth incorporates a variety of techniques, including automated activity traces, reminders and prompted inputs. This talk will present our experience to date with mHealth pilots and prototypes and will discuss areas in need of exploration: open modular tools for data collection, analysis and visualization across diverse data types; engagement such as adaptive goal setting and game mechanics; and privacy mechanisms.