1998-2002 Graduate Research Assistant in Epidemiology, Harvard School of Public Health, Boston, MA
1998-2002 Graduate Research Assistant in Oral Health Policy and Epidemiology, Harvard School of Dental Medicine, Boston, MA
2000-2002 Graduate Research Assistant in Medical Epidemiology, Karolinska Institutet, Stockholm, Sweden
2002-2003 Research Fellow in Epidemiology, Karolinska Institutet, Stockholm, Sweden
2003-2005 Research Fellow in Cancer Epidemiology, Harvard School of Public Health, Boston, MA
2003-2006 Instructor of Medicine, Harvard Medical School, Boston, MA
2003-2018 Associate Epidemiologist, Brigham and Women's Hospital, Boston, MA
2004 Instructor, Boston University School of Public Health, Boston, MA
2006-2010 Assistant Professor in the Department of Epidemiology, Harvard School of Public Health, Boston, MA
2006- Member, Cancer Epidemiology and Prostate Cancer Programs, Dana-Farber/Harvard Cancer Center, Boston, MA
2006-2016 Assistant Professor of Medicine, Harvard Medical School, Boston, MA
2007-2018 Visiting Professor of Public Health, University of Iceland, Reykjavik, Iceland
2010-2019 Associate Professor of Epidemiology, Harvard T.H. Chan School of Public Health, Boston MA
2012-2015 Foreign Visiting Professor, Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Sweden
2012-2015 Co-Leader, Cancer Epidemiology Program, Dana-Farber/Harvard Cancer Center
2012- Head, Cancer Epidemiology and Cancer Prevention Area of Concentration, Harvard T.H. Chan School of Public Health
2015-2022 Leader, Cancer Epidemiology Program, Dana-Farber/Harvard Cancer Center
2019- Faculty Director, Master’s in Epidemiology Program, Harvard T.H Chan School of Public Health
2019- Professor of Epidemiology, Harvard T.H. Chan School of Public Health, Boston MA
2022- Deputy Associate Director of Population Science, Dana-Farber/Harvard Cancer Center