Between 1933 and 1935, DeBakey remained in New Orleans to complete his internship and residency in surgery at Charity Hospital, and in 1935, he received a MS for his research on stomach ulcers. As was the trend for ambitious training surgeons at the time, and as his mentors Rudolph Matas and Alton Ochsner had done before him, DeBakey was encouraged to complete his surgical fellowships at the University of Strasbourg, France, under Professor René Leriche, and at the University of Heidelberg, Germany, under Professor Martin Kirschner.