Dr. Barnett conducts innovative methodological research in the analysis of correlated and incomplete data. He has worked on several exciting areas in biomedical data-science research, having developed novel statistical methods for large-scale genetic association analysis and for analysis of data from wearable devices and mobile health. Dr. Barnett has emerged as one of few statisticians on the forefront of digital phenotyping; his methodology has been widely applied in a range of efforts, from psychiatric disorders to patient monitoring after surgical recovery. He has brought a statistical-inference approach to the critical area of big data and plays an important role in the new Center for Statistics in Big Data.