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A nurse practitioner fulfills an important role in the healthcare system by offering a holistic approach to health care.


Our nurse practitioners take the time to get to know you, your challenges, and your goals so they can develop a clear, comprehensive, and actionable treatment plan just for you.


Then, with a plan in place, we ensure you have the support you need to be and stay well going forward. When the Nurse Practitioner Group makes referrals, we follow up with you and your specialists to make sure your care is coordinated and remains a priority.

A Relationship Built on Trust

We value open communication with our patients, where they can speak with us with confidence. When visiting your nurse practitioner, you can consult with him or her regarding the latest treatments, questions regarding care, or any concerns you may have.


View the nurse practitioner profiles below to learn more about our dedicated team, leave a review or make an appointment.


Call us to schedule a visit at 212.326.5705 or schedule an appointment online through the Connect patient portal.


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Andrea Frantz

Andrea Frantz, DNP, FNP-C, is a family nurse practitioner with a focus on adult primary care at Columbia University School of nursing, where she is also an assistant professor. She received her Master of Science in Nursing (MSN) from Yale University and her Doctorate of Nursing Practice (DNP) from Vanderbilt University. Dr. Frantz also carries a Master of Arts (MA) in Anthropology and is a graduate of the Veterans Affairs Center of Excellence in Primary Care Education Interprofessional Residency Program.

Janejira Chaiyasit nurse practitioner
Janejira Chaiyasit

Janejira Chaiyasit, DNP, RN, A-GNP-C is an adult-gerontology nurse practitioner and a teacher of nursing at Columbia University School of Nursing, her alma mater of three degrees: BS, MS, and DNP. She is also a member of the American Association of Nurse Practitioners. Chaiyasit focuses on adult health care with emphasis on health promotion, disease prevention and management, wellness, and episodic (e.g., bronchitis, pneumonia, conjunctivitis) care.

marie carmel garcon columbia nurse practitioner
Marie Carmel Garcon

Marie Carmel Garcon, DNP, OCN, CCS, FNP-C is a family nurse practitioner with over two decades of experience in acute and chronic care. She cares primarily for adults, having earned a Bachelor of Science in Nursing (BSN) from Dominican College; a Master in Gerontological Nursing (65 and older) from Lehman College; a Master of Science in Nursing (MSN) from Dominican College, and a Doctor of Nursing Practice (DNP) from Pace University. Marie’s specialty is caring for the geriatric population in their homes.

Sandra Alvarado columbia nurse practitioner group
Sandra Alvarado

Sandra Alvarado, MS, RN, NPP, PMHCNS-BC is a teacher of nursing at Columbia University School of Nursing, her alma mater where she earned her Master’s Degree. Carrying over 37 years of high-level clinical practice, Alvarado is a Psychiatric Mental Health Clinical Nurse Specialist, Nurse Practitioner, and certified psychotherapist. She specializes in psychotherapy and medication management for adults.

Headshot of Yelitza Castanos
Yelitza Castanos

Yelitza Castanos, DNP, AGPCNP-BC, is an adult-gerontology nurse practitioner and an assistant professor of nursing at Columbia University School of Nursing, where she completed her Master's in Science and Doctor in Nursing Practice. She earned her Bachelor's in Nursing from the College of New Rochelle. She has over nine years of nursing experience in psychiatric nursing, community health, leadership, and primary care. She is board certified as an Adult-Gerontology Primary Care Nurse Practitioner by the American Nurses Credentialing Center.

“When I went to see my nurse practitioner again, she remembered my name and everything we talked about. That’s what you want your care provider to do. She really takes time with me”
– Patient