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.
Patiently Answered my questions
(5 days ago)
Mar-2026
Excellent service, great doctor.
(5 days ago)
Mar-2026
The best
(1 week ago)
Feb-2026
I am so happy seeing Dr. Madero for my primary care. He answers all my questions and concerns that I have. With him I’m not a number but a person and I really appreciate him for that.
(1 week ago)
Feb-2026
Good Job ,efficient right to the point. Kind listens
(1 week ago)
Feb-2026
Nice and helpful
(2 weeks ago)
Feb-2026
Doctor madero is a very understanding doctor and I appreciate him.8
(2 weeks ago)
Feb-2026
He listens, he cares, ever mindful of the patients health.
(2 weeks ago)
Feb-2026
Exceptional people skills, listen to his patients and takes his time.
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.
Patiently Answered my questions
Excellent service, great doctor.
The best
I am so happy seeing Dr. Madero for my primary care. He answers all my questions and concerns that I have. With him I’m not a number but a person and I really appreciate him for that.
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.