I was born in Guatemala, received my training in Diagnostic Radiology at the University of Miami followed by a 2-year Neuroradiology fellowship at Emory University in Atlanta. For 18 months I was an Assistant Professor of Radiology at the University of Texas in Houston and then became Chief of the Division of Neuroradiology and Distinguished Professor of Radiology at the University of North Carolina in Chapel Hill, a position I have held for 23 years. My list of publications includes over 640 articles (peer review and invited) as principal or co-author and 27 books with the 5th edition of Neuroradiology Companion just published. I have given over 1000 invited lectures and served as Visiting Professor in over 40 occasions. Currently, I serve as President of ARRS and a member of its Executive Council. I have been President of ASNR and Editor in Chief of the American Journal of Neuroradiology. I travel extensively and for information regarding my travel schedule and conferences available click on "Travel Schedule & Conference List" on the navigation panel (right). All information found in this site is updated regularly.