Gustavo H. Day MD

Medical Director

Gustavo H. Day MD

Establishing a trustful companionship in wellness between the patient and doctor is of utmost importance at Dr. Gustavo H. Day’s practice.

The objective of his practice is participation in effective patient care, involving both inpatient and outpatient; improving quality of care and preventative medicine. Being able to design and create these custom, unique to every patient, plans, allows doctor and patient to be on the same level of understanding and feeling, leading to a motivational and very beneficial relationship between the two.

Dr. Gustavo’s passion to live a healthy and content lifestyle motivates the people around him to attempt their very best in life no matter what the case may be.

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University Degree

Born in Detroit but raised in Argentina, Doctor Day obtained his Bachelor of Science degree at Colegio Universitario Central, Universidad Nacional de Cuyo in Mendoza, Argentina.


Gustavo expanded his education by attending the medical branch of that same university; in December of 1990, he graduated to become a medical doctor in Argentina.


Motivated by his father, Dr. Jorge Horacio Day, Gustavo flew to the United States where he completed an internship and residency at St. Barnaba’s Hospital, which was affiliated with New York’s Cornell Medical Center located in The Bronx, New York.


Gustavo and Mariana have been married since March of 1994 and together they raised 4 sons: Matias, Juan Martin, Julian, and Santiago.

Medical City Dallas

In 1996, Dr. Day was accepted into the American Medical Association and became Board Certified; during that same year, Gustavo and his wife, Mariana, moved to Dallas, Texas where they started a private practice at Medical City Dallas.


Dr. Gustavo H. Day was awarded Chief Section Internal Medicine in 2001 and 2004 at Medical City Dallas;

Most Compassionate

Gustavo was voted as 2010, and recently, a 2016 Most Compassionate Doctor. Doctor Day works hard day after day to navigate and guide his patients to a state of healthy well being.

What Matias has to say about Dr. Gustavo H. Day M.D

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