Our Team
At Salus Medical Collective, our physician-led team brings together expertise in psychiatry and internal medicine with a shared commitment to compassionate, individualized care. Our physicians and psychiatric-mental health nurse practitioners work closely with patients, families, and healthcare partners to provide coordinated treatment grounded in clinical expertise, clear communication, and respect for each person’s dignity and goals.
Founder, President and Medical Director
California Physician and Surgeon | License No. A175677
Dr. Amizetta C. Clark is the founder, president and medical director of Salus Medical Collective, a physician-led behavioral health group. She is licensed as a Physician and Surgeon by the Medical Board of California and holds a Doctor of Medicine (M.D.) degree. She is board certified in Psychiatry by the American Board of Psychiatry and Neurology (ABPN) and in Internal Medicine by the American Board of Internal Medicine (ABIM).
Dr. Clark earned her medical degree from the American University of the Caribbean School of Medicine and completed a combined Internal Medicine–Psychiatry residency at the Brody School of Medicine at East Carolina University and Vidant Medical Center in 2022. Her dual training informs an integrated approach to psychiatric care, particularly for patients with complex medical and behavioral health needs.
Through Salus Medical Collective, Dr. Clark brings together clinical care, physician leadership and operational collaboration to support hospitals and behavioral health organizations. Her work emphasizes continuity of care, multidisciplinary communication, practical quality improvement and responsive clinical services.
Amizetta Clark, MD, MBA
Merrilyn Yang is a board-certified Psychiatric-Mental Health Nurse Practitioner and the Lead Nurse Practitioner at Salus Medical Collective. She brings experience in psychiatric assessment and treatment, with a particular focus on patients with complex mental health needs. Her approach combines thoughtful clinical judgment with individualized care and close collaboration with physicians, nursing staff, patients, and families.
As Lead Nurse Practitioner, Merrilyn contributes to clinical teamwork, communication, and the day-to-day coordination of care. She is valued for her dependability, attention to patient needs, and commitment to supporting both her patients and colleagues. Her work reflects the importance of consistent, compassionate care within a collaborative psychiatric team.
Merrilyn Yang, PMHNP-BC
Lemuel Constantino, PMHNP
Lemuel Constantino is a board-certified Psychiatric-Mental Health Nurse Practitioner whose background includes extensive psychiatric nursing experience at Adventist Health St. Helena. His work in inpatient psychiatry has provided a strong foundation in caring for individuals with serious mental illness, responding to psychiatric emergencies, and collaborating with multidisciplinary treatment teams.
Lemuel brings a thoughtful, engaged approach to psychiatric care, emphasizing thorough assessment, clinical collaboration, and meaningful rapport with patients. His experience working closely with nurses, physicians, and other members of the care team informs his understanding of patients’ needs throughout treatment. At Salus Medical Collective, he contributes a strong commitment to compassionate care, professional communication, and coordinated psychiatric treatment.
Betsy Hinrichsen, PMHNP
Betsy Hinrichsen is a board-certified Psychiatric-Mental Health Nurse Practitioner with experience in acute inpatient psychiatry and outpatient mental health care. She earned her Master of Science in Nursing from the Hunter-Bellevue School of Nursing and also holds a Master of Arts in Curriculum and Instruction. Her background combines psychiatric practice with an earlier career in education, informing her emphasis on patient understanding and meaningful participation in treatment.
Betsy provides comprehensive psychiatric evaluations and medication management, with experience treating mood disorders, anxiety, psychotic disorders, and substance use disorders. She brings particular experience caring for individuals with severe and persistent mental illness. Her approach emphasizes shared decision-making, strong therapeutic relationships, and practical education to help patients and families understand their diagnoses and treatment options.