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.
Exelente doctor
(6 days ago)
Jul-2026
Great doctor very attractive.
(1 week ago)
Jul-2026
Very professional, very attentive, very knowledgeable doctor.
(2 weeks ago)
Jul-2026
Dr Madero is a good Dr. He is very good in expanding issues and I like how he explains my lab results to me. I would recommend him to my family as well as my friends.
(3 weeks ago)
Jun-2026
Today, This Morning Doctor Madero gave me nothing but thee truth which is more bad news for my old & damaged spinal cord which just sadden me .
But just maybe some surgery might help.
(3 weeks ago)
Jun-2026
Very good doctor I recommend him to everyone I know always taken care of my health very understanding listens to me .very happy to be his patient
(3 weeks ago)
Jun-2026
Friendly a d Professional at the same time
(1 month ago)
Jun-2026
Listens to you.
(1 month ago)
Jun-2026
Dr Madero is an exceptional physician he addresses all of my health concerns
(1 month ago)
Jun-2026
Explained my concerns what it was and how to self home care. And time line of healing.
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.
Exelente doctor
Great doctor very attractive.
Very professional, very attentive, very knowledgeable doctor.
Dr Madero is a good Dr. He is very good in expanding issues and I like how he explains my lab results to me. I would recommend him to my family as well as my friends.
Today, This Morning Doctor Madero gave me nothing but thee truth which is more bad news for my old & damaged spinal cord which just sadden me . But just maybe some surgery might help.
Very good doctor I recommend him to everyone I know always taken care of my health very understanding listens to me .very happy to be his patient
Friendly a d Professional at the same time
Listens to you.
Dr Madero is an exceptional physician he addresses all of my health concerns
Explained my concerns what it was and how to self home care. And time line of healing.