Wearable devices developed in his laboratory include an accurate physical activity and gait monitor integrated into a shoe insole (SmartStep); a wearable sensor for objective detection and characterization of food intake (AIM); a wearable sensor system for monitoring of cigarette smoking (PACT); sensor systems for early diagnosis of risk of falling in elderly (ALARM) and others. His research has been supported by the National Science Foundation, National Institutes of Health, National Academies of Science, as well as by state agencies and private industry.