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Sarah Booth, Ph.D.
Center Director
Senior Scientist


Sarah Booth is Center Director and also holds the positions of Senior Scientist and leads Vitamin K team. Dr. Booth is an expert in vitamin K nutrition research. Her current research involves investigating how vitamins D and K impact Alzheimer’s disease and dementia, and how the gut microbiome contributes to vitamin K status.  Dr. Booth is a professor in the Biochemical and Molecular Nutrition Program at the Friedman School of Nutrition Science and Policy. Dr. Booth is treasurer for the American Society of Nutrition, and in 2018 was awarded ASN’s E.V. McCollum Award for a Senior Investigator.


Roger Fielding, Ph.D.
Associate Center Director
Senior Scientist


Roger Fielding is Associate Center Director and also holds the positions of Senior Scientist and leads the Nutrition, Exercise Physiology, and Sarcopenia (NEPS) team. He is also Professor of Nutrition at the Friedman School of Nutrition Science and Policy, Professor of Medicine at Tufts University School of Medicine and the Associate Director of the Boston Claude D. Pepper Older Americans Independence Center. Dr. Fielding studies the underlying mechanisms contributing to the age-associated decline in skeletal muscle mass, the resultant impact on function, and the potential role of exercise, nutrition, physical activity and other therapies on attenuating this process.

Steven Mello

Steven Mello
Senior Director of Administration and Operations


Steven Mello leads the financial, administrative, and operational functions at the HNRCA and serves as a key liaison to both the central university and the USDA’s Agricultural Research Service. Prior to joining the HNRCA, he was the practice lead for strategic planning, executive leadership, and organizational development at Wooster Square Consulting. Steven partnered with Fortune 500 companies and non-profit organizations in health care, finance, higher education, and the performing arts to develop and execute on strategy, to lead organizational change management processes, and to create data-driven decision models. Earlier in his career, he worked at Yale School of Management and Columbia Business School in senior leadership positions working on strategy, innovation, operational efficiency, and growth.