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.
Great doctor!
(5 days ago)
May-2026
Mi mejor doctor ..gracias
(6 days ago)
Apr-2026
Got too Visit my Health Specialist a Doctor that is always my pleasure to see fer and so far he gives me good news about me , but this time had some bad news due to .y chronic pain and weight gain is back again.
(6 days ago)
Apr-2026
He is the best. He is a good doctor and he cares about his patients. I hope he can stay around for long time. You don't find many doctor like him.
(2 weeks ago)
Apr-2026
Takes time to answer all questions. Very proactive.
(2 weeks ago)
Apr-2026
Always does a great job going over you previous labs to your current.
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.
Great doctor!
Mi mejor doctor ..gracias
Got too Visit my Health Specialist a Doctor that is always my pleasure to see fer and so far he gives me good news about me , but this time had some bad news due to .y chronic pain and weight gain is back again.
He is the best. He is a good doctor and he cares about his patients. I hope he can stay around for long time. You don't find many doctor like him.
Takes time to answer all questions. Very proactive.
Always does a great job going over you previous labs to your current.
Great
Best doctor I've had so far.
Very good doctor
Great bedside manners.