At the Karolinska, I gained expertise in using nationwide health registries to examine cancer etiology and formed a long-term partnership with epidemiology colleagues in the Nordic countries. Since 2012, my primary faculty appointment has been at the Harvard Chan School, where my research uses integrative molecular epidemiology approaches within cohorts in the United States and globally to investigate research questions focused on cancer etiology, mortality, and survivorship. I serve as co-Principal Investigator for the Health Professionals Follow-up Study as well as IRONMAN.