Kimberly Mastis, MD
Psychiatrist
148 Worcester St.
West Boylston, MA 01583
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Availability last updated 04/14/2026
Kimberly Mastis, MD
Psychiatrist
148 Worcester St.
West Boylston, MA 01583
Rosevelt Nwokeji PMHNP is a board certified Psychiatric Mental Health Nurse Practitioner clinically educated in treating patients with mental health diagnoses across the lifespan. Rosevelt earned his Bachelor of science and Master of science degrees in nursing from the MGH Institute of Health Professions, the only degree granting affiliate in the Mass General Brigham system, founded by Massachusetts General Hospital. While completing his program, he was inducted into the Sigma Theta Tau International Honor Society of Nursing and worked as a teaching assistant at the MGH IHP where he assisted his fellow nursing students in coursework related to pathophysiology.
Prior to the completion of his master’s degree, Rosevelt worked as psychiatric registered nurse in a variety of settings which included working in an adult day program providing healthcare services to adults with developmental disabilities and autism. Rosevelt also spent one year working at McLean Hospital in Belmont, MA; in the hospital’s drug, and alcohol abuse detox unit (Proctor 1) providing care to patients with various substance use disorders and assisting them on their path to recovery.
As a psychiatric nurse practitioner, Rosevelt has been working for the Massachusetts Department of Mental Health in an inpatient psychiatric forensic hospital. In this setting he provides a variety of psychiatric services such as the evaluation, diagnosis, and treatment of the hospital’s patients. He also provides expert testimony for court-authorized guardianship and treatment plans as well as commitment hearings.
Rosevelt’s interest in mental health and healthcare has been shaped by a multitude of experiences and learning opportunities that have taught him the value of compassion, empathy, intellectual curiosity, and fairness. An avid world traveler and reader, Rosevelt grew up on three continents and is multilingual; this multicultural background has helped foster Rosevelt’s dedication to providing culturally competent, holistic, and non-judgmental care to a diverse client population. In his free time Rosevelt enjoys reading, writing, martial arts and spending time with his family and friends.
Rosevelt Nwokeji, PMHNP-BC
Nurse Practitioner
112 Parker Street
Newburyport, MA 01950
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