Born to Lebanese Christian immigrants, DeBakey was inspired to pursue a career in medicine by the physicians that he had met at his father's drug store, and he simultaneously learned sewing skills from his mother. He subsequently attended Tulane University for his premedical course and Tulane University School of Medicine to study medicine. At Tulane, he developed a version of the roller pump, which he initially used to transfuse blood directly from person to person and which later became a component of the heart–lung machine. Following early surgical training at Charity Hospital, DeBakey was encouraged to complete his surgical fellowships in Europe, before returning to Tulane University in 1937. During the Second World War, he helped develop the Mobile Army Surgical Hospital (MASH) units and later helped establish the Veterans Administration Medical Center Research System.