The role of technology in delivering healthcare and improving health behaviours is growing rapidly. Technology offers enormous potential to impact hard-to-reach populations and supplement less frequent in-person care. In particular, we’re interested in the potential of artificial intelligence and conversational interfaces to supplement coaching programs, increase disclosure of information about sensitive health behaviours, and create feelings of accountability through more overt monitoring. We design mobile technologies to deliver interventions and conduct research to understand the characteristics of human-computer interaction that result in the greatest degree of positive behaviour change.