Program Directors

Ethel D. Weld, MD, PhD

Ethel D. Weld, MD, PhD

Assistant Professor of Medicine and Pharmacology and Molecular Sciences
Division of Infectious Diseases
Division of Clinical Pharmacology
Johns Hopkins School of Medicine
Baltimore, Maryland

Dr. Ethel D. Weld is an assistant professor of medicine at the Johns Hopkins University School of Medicine. Her area of expertise is clinical pharmacology.

Dr. Weld received her B.A. from New York University and earned her M.D. from the University of Chicago Pritzker School of Medicine/Biological Sciences. She completed a fellowship in clinical pharmacology and infectious diseases at Johns Hopkins.

She joined the Johns Hopkins faculty in 2016.


Matthew Spinelli, MD, MAS

Matthew Spinelli, MD, MAS

Infectious Disease Fellow
HIV, ID, and Global Medicine
Zuckerberg San Francisco General Hospital
San Francisco, California

Matthew Spinelli, MD, MAS is a research fellow in the Division of HIV, ID, and Global Medicine at Zuckerberg San Francisco General (ZSFG) and the University of California, San Francisco (UCSF). He completed his Medical Doctorate at the Mount Sinai School of Medicine. He then completed his Internal Medicine Residency, Infectious Diseases Fellowship, and a Master’s in Clinical Research and Implementation Science at UCSF. His research focuses on interventions to improve adherence and retention in care for HIV treatment and PrEP, as well as development of HIV/PrEP adherence measurement approaches. Current projects include exploring the use of urine point-of-care drug-level testing to enhance and target adherence counseling interventions for PrEP and HIV treatment. He recently received a K23 award focused on developing interventions to support PrEP adherence among young men who have sex with men. He sees patients in the HIV and PrEP clinic at Ward 86 in Zuckerberg San Francisco General.


Justin Alves, RN, ACRN, CARN

Justin Alves, RN, ACRN, CARN

Nurse Educator – Office Based Addiction Treatment, Training and Technical Assistance Program
Boston Medical Center
Boston, Massachusetts

Justin is a Clinical Nurse Educator for the State Technical Assistance and Treatment Expansion of Office Based Addiction Treatment (STATE OBAT) at Boston Medical Center, with specific expertise in infectious disease and their co-occurrence with substance use disorders, community outreach, and harm reduction. He serves as an expert on the Substance Use Disorder Care Continuum ECHO team, providing opioid addiction training and mentoring to health centers throughout the SUD care spectrum. He also sits on the item writing committee for the Addictions Nursing Certification Board, which oversees the accreditation of addiction nurses via the Certified Addictions Registered Nurse (CARN) and the Certified Addictions Registered Nurse-Advanced Practice (CARN-AP) examinations. Justin has dedicated his career to caring for patients living with HIV/AIDS and suffering from substance use disorders across the continuum of care, working first in the community for a mobile health unit offering free HIV/STI testing and case management services and most recently as a staff nurse at Massachusetts General Hospital in the Infectious Disease Division. He is an AIDS Certified Registered Nurse, serving as the President of the Boston Association of Nurses in AIDS Care, and a Certified Addictions Registered Nurse, serving as the Vice-President of the Massachusetts Chapter of the International Nurses Society on Addictions. He is also the current President of the Gamma Epsilon Chapter of Sigma Theta Tau International Honor Society of Nursing. Justin received his BSN from Northeastern University in 2013 and is currently in a MSN program at the University of Massachusetts-Dartmouth with a focus in nursing education.