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.
Friendly a d Professional at the same time
(1 week ago)
Jun-2026
Listens to you.
(2 weeks ago)
Jun-2026
Dr Madero is an exceptional physician he addresses all of my health concerns
(2 weeks ago)
Jun-2026
Explained my concerns what it was and how to self home care. And time line of healing.
(3 weeks ago)
Jun-2026
He's a good doctor cares about his patients I'll recommend him to any of my friends
(3 weeks ago)
Jun-2026
Very understanding and prompt.
(1 month ago)
May-2026
Excellent care and attention. I will miss Dr. Madero.
(1 month ago)
May-2026
He was not rushing me
Listened to my ?s and answered them
Made me feel very comfortable
(1 month ago)
May-2026
Very thorough
(1 month ago)
May-2026
Anything that I need to know about my problems he listens to me and explains very nicely
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.
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.
He's a good doctor cares about his patients I'll recommend him to any of my friends
Very understanding and prompt.
Excellent care and attention. I will miss Dr. Madero.
He was not rushing me Listened to my ?s and answered them Made me feel very comfortable
Very thorough
Anything that I need to know about my problems he listens to me and explains very nicely