About Aaron Greenstein, MD
Medical Advisor, BrainCheck
Aaron Greenstein, MD is a Harvard-trained, dual board-certified psychiatrist and geriatric psychiatrist. He brings clinical expertise in adult and geriatric mental health with a focus on care for older adults.

Dr. Aaron Greenstein is a Harvard-trained, dual board-certified psychiatrist and geriatric psychiatrist. He serves as Medical Advisor at BrainCheck, Medical Director at Kitwood Health, and as an attending psychiatrist at Mass General Hospital through the MGH Visiting Program.
Dr. Greenstein earned his BA from Yeshiva University and his MD from New York Medical College. He completed a fellowship in geriatric psychiatry through Harvard Medical School’s Mass General Brigham training program, after completing general psychiatry training at the Harvard South Shore Psychiatry Residency Training Program. During his final year of residency, he served as Chief Resident of Geriatric Psychiatry at McLean Hospital and was a John A. Hartford Foundation Health and Aging Policy Fellow with the U.S. Department of Health and Human Services.
Dr. Greenstein grew up in Denver, Colorado, and returned to his hometown after completing his education and training in the Northeast.
Clinical & Leadership Focus
- General psychiatry
- Geriatric psychiatry
- Mental health care for older adults
- Clinical leadership and program support
Expertise
Clinical focus areas
- Adult psychiatry
- Geriatric psychiatry
- Care for older adults
Leadership experience
- Medical Advisor, BrainCheck
- Medical Director, Kitwood Health
- Attending psychiatrist, Mass General Hospital (MGH Visiting Program)
Education
- BA, Yeshiva University
- MD, New York Medical College
- Residency, Harvard South Shore Psychiatry Residency Training Program
- Fellowship, Geriatric Psychiatry, Harvard Medical School / Mass General Brigham training program
Role in BrainCheck Content
As a Medical Advisor and clinical expert for BrainCheck, Aaron Greenstein, MD, provides clinical guidance and subject matter review to support the accuracy, clarity, and clinical appropriateness of BrainCheck’s educational content.
Did you know?
A good night’s sleep helps consolidate memories and improve learning, working as the brain’s personal organizer.