Our Team

At GMP, we know that a lifetime of good health cannot be attained through a one-size-fits-all approach in today's rapidly changing world. As a private practice, we are able to focus wholly on the needs of those within our practice providing an innovative, unrivaled, comprehensive state-of-the-art experience that suits the needs of today's busy patient.
At GMP, we know that a lifetime of good health cannot be attained through a one-size-fits-all approach in today's rapidly changing world. As a private practice, we are able to focus wholly on the needs of those within our practice providing an innovative, unrivaled, comprehensive state-of-the-art experience that suits the needs of today's busy patient.
Dr. Caleb   Moore
M.D.
Caleb Moore, MD, is a Board-Certified Internist and Founder of Greenwich Medical Partners, located in Greenwich, CT.
Dr. Sandra Lithgow
M.D.
Sandra Lithgow, M.D., Board Certified in Internal Medicine, is affiliated with Greenwich Hospital and Stamford Hospital.
Dr. Sara B. Seidelmann
M.D. Ph.D
Dr. Seidelmann is an internationally recognized physician scientist, with expertise in nutrition and preventive cardiology.
Dr. Catherine Joyce
M.D.
Dr. Catherine (Katie) Joyce is a board-certified Internist who joined Greenwich Medical Partners in 2021.
Dr. Herbert Archer
M.D. Ph.D
Dr. Archer is a board-certified Internist who graduated with distinction, earning a Bachelor of Sciences in Biochemistry.
Rebecca Stiritz
PSY.D
Dr. Stiritz is a clinical psychologist with over 20 years of experience.