Positions in the Lab of Tianxi Cai No current openings. Please check back. Tianxi Cai, ScD Professor of Biomedical Informatics, Harvard Medical School John Rock Professor of Population and Translational Data Sciences, Harvard T.H. Chan School of Public Health Director, Translational Data Science Center for a Learning Health System (CELEHS) Email Tianxi Cai 617-432-4923 CELEHS