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 explanation
(1 week ago)
Nov-2025
Very caring and professional.
(2 weeks ago)
Nov-2025
All this Years Dr.Madero Guillermo has given the best services. He hear what's going on with me
I THANK HIM FOR BEEN THERE WHEN I NEED HIM
(2 weeks ago)
Nov-2025
Listen to very questions I asked
(3 weeks ago)
Nov-2025
Courteous and attentive. Listens to one.
(1 month ago)
Oct-2025
My primary doctor is a very good doctor I like them very good treat me Nice and all his patients he's good
(1 month ago)
Oct-2025
I really like Dr Madero. He always takes his time listening to my concerns and explaining test results along with options for me to consider. He is definitely a credit to the
Gonzaba Group.
(1 month ago)
Oct-2025
Always friendly and take time para escucharme con paciencia. Thanks Dr Madero
(1 month ago)
Oct-2025
Awesome Doctor
(1 month ago)
Oct-2025
He listens to the patient n deals with all problems. God Bless him n Gonzaba Clinics.
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 explanation
Very caring and professional.
All this Years Dr.Madero Guillermo has given the best services. He hear what's going on with me I THANK HIM FOR BEEN THERE WHEN I NEED HIM
Listen to very questions I asked
Courteous and attentive. Listens to one.
My primary doctor is a very good doctor I like them very good treat me Nice and all his patients he's good
I really like Dr Madero. He always takes his time listening to my concerns and explaining test results along with options for me to consider. He is definitely a credit to the Gonzaba Group.
Always friendly and take time para escucharme con paciencia. Thanks Dr Madero
Awesome Doctor
He listens to the patient n deals with all problems. God Bless him n Gonzaba Clinics.