Doctor John Kottra graduated the University of Chicago Pritzker School of Medicine in 1965, a top rated hospital in the USA. His internship was performed at The University of Chicago Medical Center and his residency in radiology was finished at Stanford Hospital. His certification in diagnostic radiology was released by the American Board of Radiology. He has been practicing medicine for over 51 years and published some articles, written together with other doctors. We can mention here “Duplication of the large bowel." written together with Dodds, W. J.