Hyoshin Kim’s research has focused on child health, health care utilization, substance abuse, and tobacco control–specifically, examining changes in individuals’ health behavior over time within multiple layers of contexts *family, community, and political systems) and how contextual factors and policies influence individual health behaviors. Examples include an NIH-NCI-funded grant examining the effects of state-level and school-level tobacco control policies, as well as individual-level factors, on adolescent and young adult smoking behavior; an NIH-NIAAA- funded grant examining how ethnic differences in personal friendship networks, and alcohol-related risk and protective factors explain alcohol disparities during adolescence and young adulthood; and an AHRQ-funded grant examining the relationships between socioeconomic status and healthcare utilization among children with asthma. All of the studies used nationally representative data (Add Health and MEPS) to investigate how individual health behaviors change over time in multiple environmental contexts. Other major project that Kim has been involved in includes the examination of the relationship between hospital maternity care policies and CDC National Survey of Maternity Practices in Infant Nutrition and Care (mPINC). Dr. Kim is also working with the Battelle CPHRE Human Exposure group on two NCI-funded grants that examine variations in smoke particulates and biomarkers in experimental design settings. Other project she is currently working on is the AHRQ-funded task order that develops hospital readmission measures at hospital- level and county-level using Healthcare Cost and Utilization Project (HCUP) data. Currently she is preparing a manuscript examining whether and how intervention components of the Korean national smoking cessation program are associated with the likelihood of smoking cessation and how the association differs by socioeconomic status.