The author, Alex Mamourian MD, began his radiology training over thirty years ago and just when CT was first arriving in radiology departments. His radiology training included a fellowship in MR imaging at the University of Pennsylvania and another in neuroradiology at the Barrow Neurologic Institute. He is currently on faculty at the University of Pennsylvania in the department of Radiology. The focus of his career has been on radiology education and cross sectional imaging with both MR and CT.