My research lies in the intersection of human-computer interaction, ubiquitous computing, and health informatics. My high-level research goal is to leverage and expand the sensing capabilities of widely used technologies to assess well-being. This involves data-driven, domain-driven, and user-centered approaches to (i) rethink the use-cases of existing sensors on smart devices, (ii) extend sensing capabilities to acquire human behaviors, and (iii) leverage such behaviors to model individual well-being. Such an iterative strategy allows me to study the feasibility and efficacy of the designed system in real-world contexts. In this way, I strive to make empirical, methodological, and technical contributions to the assessments of people’s well-being.