About
Dr. Alan Merin brings exceptional academic credentials and four decades of clinical experience to My Personal Physician. He earned an AB in history with honors from Duke University in 1972, then graduated from the Medical College of Virginia in the top five of his class. That achievement earned him election to the Alpha Omega Honorary Society. He completed a three-year internal medicine residency at Case Western Reserve in Cleveland, Ohio, under the mentorship of Charles CJ Carpenter, MD.
Dr. Merin then pursued a three-year clinical and research nephrology fellowship at the University of Texas Southwestern in Dallas. For the past 40 years, he has cared for critically ill patients in San Antonio with kidney, heart, diabetic, and vascular disease. He averages 300 hours of medical lectures per year to stay current with evolving treatments. Dr. Merin finds the most rewarding part of medicine in the close relationships he builds with patients over time. He welcomes complicated cases and the depth of understanding that comes from truly knowing the people in his care. He and his wife Audrey have two daughters pursuing graduate degrees in religion and public policy.
Education & Training
Undergraduate
Duke University, AB History with honors (1972)
Medical School
Medical College of Virginia (top five of class; elected to Alpha Omega Honorary Society)
Residency
Internal Medicine, Case Western Reserve, Cleveland, Ohio (3 years, under Charles CJ Carpenter MD)
Fellowship
Nephrology (clinical and research), University of Texas Southwestern, Dallas (3 years)
Conditions Treated
Who is Dr. Merin right for?
Dr. Alan Merin is an excellent fit for patients managing complex or serious conditions, particularly kidney disease, heart disease, diabetes, and vascular disease. Older adults and those with multiple overlapping diagnoses benefit from his depth of experience and nephrology fellowship training. He welcomes difficult cases and builds long-term relationships with the patients he follows closely. Patients who want a physician who stays current through continuous learning will find a strong match in Dr. Merin.
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Frequently Asked Questions
Dr. Merin specializes in internal medicine and geriatric medicine. He has a clinical background in nephrology and has spent 40 years treating critically ill patients in San Antonio with kidney, heart, diabetic, and vascular disease.
Dr. Merin earned his medical degree from the Medical College of Virginia, graduating in the top five of his class. He completed a three-year internal medicine residency at Case Western Reserve in Cleveland, Ohio, followed by a three-year nephrology fellowship at the University of Texas Southwestern in Dallas.
Dr. Merin averages 300 hours of medical lectures per year. That commitment to continuing education keeps him current on evolving treatments for the complex conditions his patients face.
Dr. Merin typically cares for patients with serious chronic conditions including kidney disease, heart disease, diabetes, and vascular disease. He has a strong interest in complicated cases and brings decades of critical care experience to each patient relationship.
Yes. Dr. Merin specializes in geriatric medicine and has spent four decades treating patients with the chronic, overlapping conditions common in older age. His depth of experience and his focus on long-term patient relationships make him a strong choice for older adults seeking thorough, continuous care.
Dr. Merin finds the greatest reward in the closeness he develops with patients over time. He values the depth of knowing each patient fully and enjoys the intellectual challenge of complicated cases.
Doctor profile last updated March 22, 2026