Left to right: Patricia Poitevien, MD, MSc; Angela Zhang, 2019-2020 ODMA Diversity Fellow, MD '21Joseph Diaz, MD, MPH, FACP; Tracey Guthrie, MD; Rosedelma Seraphin, MA; Natasha Rosa, BA. (not pictured: Mercedes Domenech, MD, Ph.D.)


Joseph Diaz, MD, MPH, FACP

Associate Dean for Diversity and Multicultural Affairs.

Dr. Diaz is a primary care provider at Memorial Hospital of RI, a Care New England hospital.  A graduate of Brown Medical School, Dr. Diaz completed a residency and fellowship in General Internal Medicine at Rhode Island Hospital before joining the Department of Medicine and the Center for Primary Care and Prevention at Memorial Hospital of RI in 2001. Since joining the faculty, Dr. Diaz has been actively involved in medical education, served as a site director for the core clerkship in medicine, and was a lead faculty member in the Alpert Medical School Academy system. He is currently a co-director of the Scholarly Concentration in Care of the Underserved. 

Dr. Diaz’s clinical work and research focus on the delivery of health care to underserved populations. His research has centered on assessing and addressing disparities in preventive health with a focus on the role of language and culture as a barrier to colorectal cancer screening.

Dr. Diaz oversees the Office of Diversity and Multicultural Affairs, which helps to create and foster a diverse, inclusive, and culturally competent learning and training environment for students, faculty, and trainees within the Division.


Mercedes Domenech, MD, PhD

Associate Director of Admission and Associate Dean of Medicine

In January of 1995, Mercedes Domenech MD PhD was hired as the first MD dean for the office of Minority Affairs as it was known then. Dean Domenech serves as the Associate Director of Admission and Associate Dean of Medicine concentrating mostly on the undergraduate years of the PLME.


Tracey Guthrie, MD

Assistant Dean for Diversity. 

Dr. Guthrie is the Program Director of the Psychiatry Residency Program at Brown. She graduated from the University of Rochester School of Medicine and Dentistry. She continued her training at the Brown Psychiatry Residency Training Program where she was Chief Resident. Dr. Guthrie has been involved with medical student education at Brown since 2002 and psychiatry residency training since 2005.  She has served in many leadership roles within the Medical School including Clerkship Site Director and Associate Clerkship Director in Psychiatry for Brown medical students; Assistant and Associate Residency Program Director in the Department of Psychiatry and Human Behavior. 

Dr. Guthrie's clinical work has focused on the acute treatment of patients with severe mental illness. In her role with the Office of Diversity and Multicultural Affairs, her desire is to help Brown continue to grow as an inclusive environment and to provide mentorship for students, trainees and faculty.      


Patricia Poitevien, MD, MSc

Assistant Dean for Diversity. 

Dr. Poitevien is a Pediatric Hospitalist and the director for the Pediatric Residency Program at Hasbro Children’s Hospital. She is a graduate of the Program of Liberal Medical Education at Brown University and completed her residency training in Pediatrics at NYU Langone Health / Bellevue Hospital Center. She completed a Chief Resident year at NYULH/BHC and subsequently stayed on as faculty, ultimately becoming Residency Program Director in 2013. She joined Hasbro/Brown in 2018. Dr. Poitevien is passionate about mentoring underrepresented trainees to remain in academic medicine to amplify their positive impact on the learning environment. Dr. Poitevien’s clinical work focuses on the inpatient management of acutely ill children. While on the wards she spends time teaching students, residents and faculty how best to manage their biases in patient care and in medical education. Nationally she facilitates workshops for faculty to help them create more inclusive and socially just environments for learning.

Natasha Rosa, BA

Administrative Coordinator

Before coming to Warren Alpert Medical School, she was the Nurse-Family Partnership project coordinator for Children’s Friend and Services in Pawtucket, RI.  Natasha is a native New Yorker, born and raised in the Lower East Side of Manhattan. She went to Trinity College in Hartford, Connecticut where she received a BA in Educational Studies and a minor in Hispanic Studies.  In addition to her work with the ODMA, Natasha is pursuing a Master’s degree in Public Administration from Roger Williams University.


Angela Zhang, MD '21

2019-2020 Diversity Fellow

Originally from Seattle, WA, Angela graduated from Duke University with a self-designed major, Mass Media & Cross-Cultural Perception, which explored the ways media shape us, with an emphasis on the experience of immigrant families. She lived in Baltimore before AMS, doing research in Parkinson's and becoming involved in Asian Pacific Islander American (APIA) activism. At Alpert, her interests have included refugee/immigrant health, the health impacts of climate change, sexual health/reproductive justice, and API advocacy and allyship. In her future career, Angela hopes to continue to advocate with underserved communities and to produce responsible health journalism that normalizes stigmatized topics.