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.
His very polite person and a good doctor
(4 days 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
(5 days ago)
Aug-2026
Very thorough
(5 days 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
(1 week ago)
Aug-2026
He explains every thing to me. I like that about him.. which I can under
Great person
Great Doctor
(1 week ago)
Aug-2026
He’s patient, kind & thorough
(2 weeks ago)
Aug-2026
Definitely was very helpful with everything that I asked about the check up and consultation and a professional Doctor he demonstrated I'm very grateful to Gonzaba how they were so helpful and understanding I'm very impressed with them a highly recommend them to anyone who needs medical assistance.
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.
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
He explains every thing to me. I like that about him.. which I can under Great person Great Doctor
He’s patient, kind & thorough
Definitely was very helpful with everything that I asked about the check up and consultation and a professional Doctor he demonstrated I'm very grateful to Gonzaba how they were so helpful and understanding I'm very impressed with them a highly recommend them to anyone who needs medical assistance.
Nice talk!
Good
He’s always amazing