close Call Us (401) 729-2000
Ruthie Salguero - Program Coordinator
111 Brewster Street
Pawtucket, RI 02860
P: (401) 729-2221

Joseph Diaz, MD
Department of Medicine Chief

Joseph Diaz, MD, MPH, joined the medical faculty and the Center for Primary Care and Prevention at Memorial in 2001 after completing his residency and a fellowship in general internal medicine at Rhode Island Hospital. Dr. Diaz is an associate professor of medicine at The Warren Alpert Medical School of Brown University, and is an active clinician, educator and researcher. His research, supported by a career development award from the National Cancer Institute, focuses on colorectal cancer screening among primary care patients. In addition to his clinical and research work, Dr. Diaz is co-coordinator of the Department of Medicine's medical exchange program to the Dominican Republic.

Dino Messina, MD
Program Director

Dino Messina, MD, PhD, is medical director of the outpatient Internal Medicine Clinic at Memorial and a clinical assistant professor of medicine at The Warren Alpert Medical School of Brown University. In 2014 - his first year at Memorial - he earned a teaching achievement award and the Arthur M. Phillips MD Mentorship Award “in recognition of ongoing dedication to the fostering of residents’ personal and professional growth and development.” His research interests include improving health care for vulnerable populations, teaching safe opioid prescribing to internal medicine residents, and improving chronic disease management and outcomes.

Sajid Saraf, MD
Associate Program Director

Sajid Saraf, MD, is an academic hospitalist at Memorial. He completed his medical education at the Army Medical College and a fellowship in otolaryngology in Pakistan, where he practiced for many years. Dr. Saraf completed the Internal Medicine Residency Program at Memorial in 2011. He is board-certified in internal medicine.

Salaheldin Elhamamsy, MD
Assistant Program Directors

Salaheldin Elhamamsy, MD, a graduate of the Memorial Hospital Internal Medicine Residency Program, is a primary care physician, the medical director of Oak Hill Health and Rehabilitation Center, and assistant clinical professor of medicine at The Warren Alpert Medical School of Brown University. In 2014, he was given the Excellence in Teaching Award for clinical volunteer faculty. His interests include raising awareness of careers in primary care, transitional care, and care of the elderly.

Sabrina Witherby, MD
Sabrina Witherby, MD, is fellowship site director for The Warren Alpert Medical School in hematology/oncology at Memorial and Roger Williams hospitals, and clinical educator in the Division of Hematology/Oncology at Memorial. She is also assistant professor of medicine (clinical) at the Alpert Medical School, for which she earned the Beckwith Family Teaching Award in 2013. Her research interests include cancer survivorship, cancer epidemiology, anemia, and breast cancer treatment.
Internal Medicine Residency
Joy Carufel - Program Secretary, Ruthie Raposo – Program Coordinator)