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.
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.
All went well with my vitals. Just need a couple of things to get done
Very positive outlook.
(2 weeks ago)
Sep-2026
Top notch Dr. Very through and listens. I highly recommend.
(2 weeks ago)
Sep-2026
Very through
(3 weeks ago)
Sep-2026
I can't say enough about Dr. Madero
He always takes the time to ask how everything is going with you and to explain your labs
Excellent Dr.
(1 month ago)
Sep-2026
My doctor was very attentive to my concerns.
(1 month ago)
Sep-2026
Thank You for being so kind and helpful,
(1 month ago)
Aug-2026
His very polite person and a good doctor
(1 month ago)
Aug-2026
His a good Dr. His never in a rush, explains labs, he listens to what I say he offers different medical options of what can help me. I'm thankful for his service
(1 month ago)
Aug-2026
Very thorough
(1 month ago)
Aug-2026
He's an excellent doctor wouldn't change him a bit he knows me he knows who I am he take care of me and we have a good doctor and patient relationship the best doctor in the clinic
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.
All went well with my vitals. Just need a couple of things to get done Very positive outlook.
Top notch Dr. Very through and listens. I highly recommend.
Very through
I can't say enough about Dr. Madero He always takes the time to ask how everything is going with you and to explain your labs Excellent Dr.
My doctor was very attentive to my concerns.
Thank You for being so kind and helpful,
His very polite person and a good doctor
His a good Dr. His never in a rush, explains labs, he listens to what I say he offers different medical options of what can help me. I'm thankful for his service
Very thorough
He's an excellent doctor wouldn't change him a bit he knows me he knows who I am he take care of me and we have a good doctor and patient relationship the best doctor in the clinic