Dr. Joanna Loewenstein

Dr. Joanna Loewenstein

Internal Medicine

New York

Internal Medicine

Dr. Joanna Loewenstein is a board-certified internal medicine physician who combines her love of listening with her enthusiasm for technology to provide preventive, personalized care. Dr. Loewenstein has special expertise in nutrition, exercise, weight management, and in the intersection of mental and physical health. She believes in empowering her patients and working with them as a true partner so each person can find what works best for them over the long-term.

“I believe patients should have autonomy,” Dr. Loewenstein says. “While doctors have a level of expertise, I believe people know their bodies, and I really do want input from patients about what they think is going on with their health.”

Dr. Loewenstein grew up on Long Island watching her father make house calls and build close relationships with patients as a small-town doctor. She always enjoyed talking to new people, and when she decided to pursue medicine, she knew her approach would include really getting to know her patients—not just their diagnoses.

After graduating magna cum laude with a Bachelor of Arts in chemistry and art history from Columbia University, Dr. Loewenstein earned her medical degree from New York University Grossman School of Medicine and completed her residency in internal medicine at NYU.

Dr. Loewenstein then went to Weill Cornell Medicine, where she stayed for a decade until coming to Atria in 2025. At Weill Cornell, Dr. Loewenstein became an Assistant Clinical Professor of Medicine and most recently founded the system’s first concierge medicine practice. Previously, she also founded Weill Cornell’s Integrative Behavioral Health program, where doctors screen and treat patients for anxiety and depression through the primary care department. This allowed Dr. Loewenstein to work closely with psychiatrists and to see the many ways mental health intersects with their physical health.

Dr. Loewenstein moved to Florida and pioneered telemedicine at Weill Cornell. After returning to New York in 2020, she used her telehealth expertise to help colleagues adapt during COVID-19 and ran a remote monitoring program for patients.

Dr. Loewenstein has carried the lessons of that time with her into her ongoing practice. She loves the ability to see patients in person and seamlessly incorporate technology so she can continue to care for people wherever they are, using leading-edge diagnostic and imaging tools to give patients the highest quality treatment.

“When you have technology and you have the ability to speak to patients when they really need you, it allows us to stretch the limits of our medical expertise and not just pull the trigger to send people to the emergency room,” Dr. Loewenstein says. “I like to think about, how can we really use technology to make people’s lives better and optimize their health?”

Dr. Loewenstein is passionate about the importance of nutrition and exercise, and she has served on the Executive Advisory Board of Eli Lilly since 2020, consulting on Mounjaro, Zepbound, and other diabetes and obesity medications. She has seen GLP-1 drugs change lives and says it’s an exciting time to help patients manage their weight and metabolic health.

Dr. Loewenstein knows the best conversations about patients’ health come from spending sustained time together and building mutual understanding. She often shares examples from her own life so that each person can get to know her on an individual level and trust her recommendations, whether those involve medications, health guidance, or referrals to other specialists.

“Atria’s model is very comforting: knowing that the door’s never closed. That allows us to make better decisions together, because we’re not making reactive decisions out of fear of what’s going to happen if there’s no doctor for me,” Dr. Loewenstein says. “This has helped me understand not just what is a safe way that we can care for patients, but what is the best way that we can care for patients.”

Dr. Loewenstein is fluent in Spanish and lives with her husband and two sons in New York. She loves exercise, Latin dance, cooking with healthy ingredients, and has perfected the art of challah making.

Credentials

Clinical Assistant Professor of Medicine

Weill Cornell Medical College

Former Director

Integrated Behavioral Health Program, Weill Cornell Medical Associates

Former Internal Medicine Physician

Weill Cornell Medical Associates

Awards

New York Rising Stars 2022-2024

Super Doctors

Affiliations

Executive Advisory Board Member

Eli Lilly

Former Medical Consultant

Spatial

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