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.
Good Job ,efficient right to the point. Kind listens
(2 days ago)
Feb-2026
Nice and helpful
(5 days ago)
Feb-2026
Doctor madero is a very understanding doctor and I appreciate him.8
(1 week ago)
Feb-2026
He listens, he cares, ever mindful of the patients health.
(1 week ago)
Feb-2026
Exceptional people skills, listen to his patients and takes his time.
(1 week ago)
Feb-2026
Very professional.
(2 weeks ago)
Feb-2026
Dr, Madero is very professional and caring. He gave me a clear view of my health and well being. I did enjoy my time and visit with Gonzaba . Thank you from Jesus Alberto Flores .
(2 weeks ago)
Feb-2026
He's literally the best
(2 weeks ago)
Feb-2026
Oh MG very patient spoke in terms I could understand took his time with me and made sure he answered all my questions
(3 weeks ago)
Feb-2026
Love my Doctor he always does good to make sure my health is good and cares how I am feeling to prescribe me what will help me if anything is prescribed. Good Doctor!
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.
Good Job ,efficient right to the point. Kind listens
Nice and helpful
Doctor madero is a very understanding doctor and I appreciate him.8
He listens, he cares, ever mindful of the patients health.
Exceptional people skills, listen to his patients and takes his time.
Very professional.
Dr, Madero is very professional and caring. He gave me a clear view of my health and well being. I did enjoy my time and visit with Gonzaba . Thank you from Jesus Alberto Flores .
He's literally the best
Oh MG very patient spoke in terms I could understand took his time with me and made sure he answered all my questions
Love my Doctor he always does good to make sure my health is good and cares how I am feeling to prescribe me what will help me if anything is prescribed. Good Doctor!