Dr. Day was born in Detroit, Michigan; however, he lived a great portion of his life in Argentina, where he was raised and where he completed most of his academic work.   Dr. Day is a graduate from Universidad Nacional de Cuyo in Mendoza, Argentina.   He completed his medical recidency in St. Barnabas Hospital in New York. Dr. Day is certified by the American Association of Internal Medicine, and is a member of the American Association of Medicine, as well as the Dallas County Medical Association. Doctor Gustavo H. Day is married and a father of four boys.