Verified Reviews
You can trust
You can trust
Guillermo Madero, M.D.
Gonzaba Medical Group
Internal Medicine: Geriatrics
San Antonio, TX
4.9
1.2K Ratings
516 Comments
Dr. Guillermo Madero graduated from the University of Monterrey Mexico, where he received his medical degree. After living in Mexico for 25 years, and with only two pieces of luggage, Dr. Madero moved to New York City for his residency and fellowship at Staten Island University Hospital. Dr. Madero started with Gonzaba Medical Group in 2021.
4.9
1.2K Ratings
516 Comments
Dr. Guillermo Madero graduated from the University of Monterrey Mexico, where he received his medical degree. After living in Mexico for 25 years, and with only two pieces of luggage, Dr. Madero moved to New York City for his residency and fellowship at Staten Island University Hospital. Dr. Madero started with Gonzaba Medical Group in 2021.
The reviews listed below were collected independently of Gonzaba Medical Group through rater8. Each review represents an authentic and verified patient experience.
Read More
Born and raised in Monterrey, Mexico, Dr. Guillermo Madero graduated from the University of Monterrey Mexico, where he received his medical degree. After living in Mexico for 25 years, and with only two pieces of luggage, Dr. Madero moved to New York City for his residency and fellowship at Staten Island University Hospital. In 2015 Dr. Madero and his wife moved to San Antonio, Texas to start a family and to be closer to home.
Growing up in a Catholic family an educational priest invited Dr. Madero to attend a seminar to consider becoming a priest. Though he did not ultimately become a priest, what Dr. Madero learned, was that through the philosophy of “men in the service of mankind” was that by becoming a doctor, he could serve others helping them achieve a better lifestyle and healthier outcomes. He also learned about the Virgin de Guadalupe, encouraging him to reach out to his faith for guidance. Having a “Guadalupe” Clinic at GMG was a beautiful symbol for Dr. Madero.
Dr. Guillermo Madero, M.D. started with Gonzaba Medical Group in 2021. He loves that GMG caters to seniors and to the geriatric community, treating each patient Como Familia, Like Family. It is important to him that GMG is physician-led and focuses on the outcomes of patients.
In Dr. Madero’s free time he enjoys spending time with his wife and two small children, running, and hiking. You may catch him reading a Stephen King or Michael Crichton novel, playing backgammon, dominos, grilling some carnitas asadas, and watching his favorite soccer team, Rayados of Monterrey.
© 2025 All Rights Reserved. rater8.
He always takes his time. Ask if we have any questions. Very polite and friendly
My first time seeing Dr Madero and I was very pleased. He's a very confident and soft spoken dr. He was thorough and asked all the right questions. I was comfortable and found him very easy to talk to.
Wet courteous and answered all questions.
I had a very productive appointment with Dr. Madero. He’s courteous, polite and efficient. Listens and acts on my concerns and answers all my questions.
Very attentive answer all my questions in a friendly manner. Best doctor I’ve ever had
I have always gotten the best service. Dr.Guillermo Madero. Thank you !
Excellent Dr. very Professional.
He awesome and very accurate with what’s going on with me.. I hope he stays my Dr forever
Listens to needs
I like Dr. Madero, he is excellent in a very good year, thank you very much.