Takuya Kawahara is a postdoctoral research fellow in the Department of Population Medicine at the Harvard Pilgrim Health Care Institute and Harvard Medical School. Under the supervision of Dr. Jessica Young, his research at Harvard focuses on the novel applications and simulation studies of causal inference methods when the outcome is subject to competing or truncation events in cancer trials. Prior to his doctoral training at the institute, he served as a biostatistician in university hospitals. He earned his PhD and MPH from the University of Tokyo. His research interests include statistical methods in clinical studies, causal inference, truncation by death, missing data, principal stratification, and patient-reported outcomes. His collaborative research areas include oncology, neurology, pulmonary surgery, palliative care, behavioral studies, and epidemiology.