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.
Dr Madero is great doctor listens to my needs and helps me reach my goals to be in better health. ☆☆☆☆☆+
(5 days ago)
Mar-2026
Dr. Madero Is A Great Doctor, He Takes The Time To Listen And Answer All Your Questions In A Way That You Understand
(6 days ago)
Mar-2026
He explained everything and answered my questions
(1 week ago)
Mar-2026
Dr. Madero shows great concern in listening to my wife's issues and problems. He always gives his best advice and recommendations to help my wife. He doesn't hesitate to change things if needed. Thank you Dr. Madero
you are outstanding. ⭐️⭐️⭐️⭐️⭐️⭐️⭐️⭐️⭐️⭐️
(1 week ago)
Mar-2026
Dr. Madero was very concerned about my health and explained to me what was going on by detail.
(1 week ago)
Mar-2026
Dr Madero, is a very kind Dr. This was my first time meeting with him, and he made me feel very comfortable.
(1 week ago)
Mar-2026
He is a very caring and positive doctor. He gives good advice and has solutions to problems l am having physically. He is very likable as well, with a good personality. I am grateful to have him as my PCP.
(2 weeks ago)
Mar-2026
Dr. Madero
Is an excellent Dr that will ask you questions as to how you're feeling How your health is doing What do you need I really appreciate his care and concern
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.
Dr Madero is great doctor listens to my needs and helps me reach my goals to be in better health. ☆☆☆☆☆+
Dr. Madero Is A Great Doctor, He Takes The Time To Listen And Answer All Your Questions In A Way That You Understand
He explained everything and answered my questions
Dr. Madero shows great concern in listening to my wife's issues and problems. He always gives his best advice and recommendations to help my wife. He doesn't hesitate to change things if needed. Thank you Dr. Madero you are outstanding. ⭐️⭐️⭐️⭐️⭐️⭐️⭐️⭐️⭐️⭐️
Dr. Madero was very concerned about my health and explained to me what was going on by detail.
Dr Madero, is a very kind Dr. This was my first time meeting with him, and he made me feel very comfortable.
He is a very caring and positive doctor. He gives good advice and has solutions to problems l am having physically. He is very likable as well, with a good personality. I am grateful to have him as my PCP.
Dr. Madero Is an excellent Dr that will ask you questions as to how you're feeling How your health is doing What do you need I really appreciate his care and concern
Patiently Answered my questions
Excellent service, great doctor.