I am a Professor of Biostatistics at the Rocky Mountain Center for Occupational and Environmental Health. I earned my Doctor of Science degree in Biostatistics from Harvard University in 1997 and worked in the Department of Biostatistics at the University of Rochester (UR) for 11 years and in the Department of Epidemiology and Biostatistics at Texas A&M Health Science Center for 15 years, prior to joining University of Utah. My research interests include longitudinal and multilevel data analysis, survival analysis, infectious disease modeling, causal inference, and machine learning. Throughout my career I have collaborated extensively with researchers from various fields including Epidemiology, Community Medicine, Neurology, Cancer, and cardiovascular diseases. I have made significant contributions to estimating quality-adjusted survival time and conducting medical costs analyses with censored data.