Our Providers

Ready to Care

The doctors and nurse practitioners at SSTAR demonstrate a wide range of specializations and treatment options, including pain management, addiction, infectious disease, endocrinology, HIV/AIDS, and more. Above all else, our knowledgeable staff is ready to treat you with the care and compassion you deserve.

The Family Healthcare Center

George Maxted, M.D.

Dr. Maxted is a highly experienced family physician, educator, and medical leader with over four decades of clinical and academic service. He completed his Family Medicine residency at Duke University in 1980 and has spent most of his career as a Medical Director while remaining actively involved in patient care, teaching, and mentorship. His roles have included faculty and leadership positions at Tufts University/Cambridge Health Alliance, Valley-Wide Health Systems, Mercy Regional Medical Center, the University of Colorado, the University of Massachusetts, and the Family Health Center of Worcester. He also served 21 years in the Indian Health Service as a Captain in the U.S. Public Health Service. Dr. Maxted holds a Certificate of Added Qualifications in Geriatrics (and previously Sports Medicine) and has special expertise in geriatrics, sports medicine, addiction, evidence-based medicine, decision-making, office procedures, pain management, and the full scope of family medicine.

Cara Zimmerman, M.D.

Cara Zimmerman, MD and MBA as an Addiction Medicine physician at SSTAR and also the Medical Director of Primary Care Based Substance Use Disorder Treatment (MAT/OBAT) at Thundermist Health Center in Woonsocket, RI. She completed her Addiction Medicine and Internal Medicine training at Brown University and is a Clinical Assistant Professor of Medicine at Brown University. She has an MBA in Healthcare Management from Clarkson University and is a fierce advocate for harm reduction in her addiction practice. She is interested in quality improvement and systems processes, nontraditional forms of care delivery such as street medicine and low barrier care, and behavior change with motivational interviewing. She serves as a volunteer and the Chairman of the Board of Directors of the leading harm reduction organization in Rhode Island, Project Weber/RENEW. She consults as part of the Opioid Response Network to teach colleagues about substance use disorder and loves being part of a multidisciplinary team.

Donald Page Rice, Jr., M.D.

Dr. Rice joined SSTAR as an Internal Medicine provider and Infectious Diseases specialist in December, 2017. He also works for the division of Infectious Diseases at The Miriam Hospital and Rhode Island Hospital. He graduated in 2012 from Eastern Virginia Medical School. He completed Internal Medicine residency at Lankenau Medical Center in Wynnewood, PA followed by fellowship in Infectious Diseases at the University of Connecticut Health Center in Farmington, CT. His clinical and research interests include HIV and HCV care. Dr. Rice speaks Spanish.

Jesus Sosa, M.D.

Courtney Guerrera, F.N.P.

Courtney is a new Nurse Practitioner in the health center at SSTAR. She was a former nurse case manager in the MAT department for 4 years and previously worked at Charlton Memorial Hospital for 3 years as a registered nurse. She received her bachelor’s degree from Curry College in 2017 and her master’s degree from Simmons University in 2024. She is passionate about helping others and providing patient-centered, low barrier care to all walks of life. In her free time, she enjoys keeping up with her two young children, spending time with family and friends, reading, and enjoying the outdoors.

Grace Sweetser, F.N.P.

Grace is a new Nurse Practitioner at SSTAR, she received her nursing education at UMass Boston and Pace University.  She recently moved from New York City where she spent 5 years working as a registered nurse at Memorial Sloan Kettering Cancer Center.  She has a passion for patient centered primary care and is excited to join the amazing team here at SSTAR.  Outside of work she enjoys spending time with my family and friends, she loves being outdoors and being active.  This summer she learned how to play pickleball! She has a passion for cooking and loves trying new recipes in her free time.

Hannah Girard, F.N.P, DNP

Hannah joined SSTAR in 2021 as a Family Nurse Practitioner providing services in Primary Care, Infectious Disease, Gender-Affirming Hormone Therapy and Substance Use Disorders. She completed The University of Massachusetts Department of Family Medicine and Community Health / New England AIDS Education and Training Center / Family Health Center of Worcester HIV and Viral Hepatitis Fellowship in Worcester, where she previously practiced. She is a graduate of the University of Massachusetts Medical School Graduate School of Nursing where she received her Doctor of Nursing Practice (DNP) as a board-certified family nurse practitioner (FNP-BC). She is also a graduate of Arcadia University with a Master of Public Health in Community Health as well as a Master of Arts in International Peace & Conflict Resolution with a certificate in Restorative Justice. She speaks English, French and Spanish. She was raised in the northern Berkshires of rural western Massachusetts and loves to talk about nature, music, family, and culture.

Maxine Dube, F.N.P

Maxine is a Board-Certified Family Nurse Practitioner who joined SSTAR in 2024. She has a passion for physical and mental health and wellness, utilizing an interdisciplinary approach. Maxine has a Bachelor’s in Biology from UMass Amherst, Bachelor’s in Nursing from Northeastern University, and Master’s in Nursing from Mass College of Pharmacy Worcester. In her spare time, she enjoys fitness training and spending time with friends and family. Her goal is to advocate for and serve the community to effect pragmatic change.

Rose Saint-Aine, BSN, FNP-C

Rose is a Family Nurse Practitioner and educator dedicated to compassionate, culturally sensitive, and patient-centered care. She earned her BSN from Simmons University and her advanced practice degree from United States University.

She combines clinical experience across inpatient, urgent care, and outpatient settings with a passion for teaching and mentoring future nurses. At SSTAR, she promotes holistic wellness, focusing on prevention, chronic disease management, and health equity—especially for vulnerable populations and those with substance use disorders. She is committed to reducing stigma and empowering patients through respectful, collaborative care. She believes that “care is a form of respect.”

Ambulatory Behavioral Health

Enoch Anyanwu, PMHNP-BC

Enoch is a board-certified Psychiatric Nurse Practitioner who believes that all humans have an innate ability to thrive.  His approach is to help individuals realize this regardless of mental health challenges.  He utilizes a collaborative approach with careful psychopharmalogical  management in conjunction with psychotherapy for best outcomes.  “Understanding the human brain as a complex structure with an intricate network of neuro-chemical activity and individual experiences is important to understand.”

Joyce Onyango, PMHNP

 

 

Kennia Dely, PMHNP

Maggie Carr, PMHNP

Mathew P. Bock, PMHNP

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