My research focuses on the epidemiology of hematopoietic malignancies, on oncogenic virus infections, and on the assessment of immune dysfunction for epidemiologic studies. My primary active research projects are prospective evaluations of lifestyle correlates of energy balance (anthropometric measures, physical activity, diet), and of biomarkers of growth factor, cytokine and other endogenous hormone dysregulation, in the etiology of multiple myeloma (MM) and lymphoma. I conduct studies in the Nurses' Health Study (NHS) and the Health Professionals Follow-up Study (HPFS) populations and biorepositories at the Channing Division of Network Medicine (Department of Medicine, Brigham and Women's Hospital and Harvard Medical School) and in collaborative contexts, including with colleagues in the Dana-Farber/Harvard Cancer Center SPORE in Multiple Myeloma, the International Lymphoma Epidemiology (InterLymph) Consortium, the International Multiple Myeloma Consortium (IMMC) and the Lymphoid Malignancies Working Group (LMWG) of the NCI Cohort Consortium. As a present co-leader of the LMWG and former Chair of IMMC and of the Infections and Immunology Working Group of InterLymph, I help to facilitate cross-consortium communication to nurture further collaboration on etiologic research, and I represent the NHS and HPFS cohorts in a large international consortium (formed among InterLymph and LMWG member studies) conducting a genome-wide association study of NHL. Lastly, I am involved in an international, multi-center study of plasma markers of immune dysregulation and risk of adult T-cell lymphoma among carriers of human T-lymphotropic virus type-I, and in a population-based case-control study of dietary pattern and risk of Hodgkin lymphoma.