Robert Y. Shih, MD
Neuro Section Chief 
American College of Radiology Institute for Radiologic Pathology (AIRP)
Silver Spring, MD

Robert Shih, MD is Chief of Neuroradiology and MRI at Walter Reed National Military Medical Center in Bethesda, Maryland and Associate Chief of Neuroradiology for the American Institute for Radiologic Pathology in Silver Spring, Maryland. He holds an academic appointment as Assistant Professor of Radiology at the Uniformed Services University of the Health Sciences in Bethesda, Maryland.

Dr. Shih received his Bachelor of Arts at Harvard University in 1998 and Doctor of Medicine at Washington University in St. Louis in 2002. His radiology residency was at Tripler Army Medical Center in Honolulu, Hawaii from 2004 to 2008.  In 2010, Dr. Shih completed his neuroradiology fellowship at University of California in San Francisco.

Dr. Shih was certified by the American Board of Radiology in 2008 and received a Certificate of Added Qualification in Neuroradiology in 2012. Dr. Shih is licensed in California.

Ellen M. Chung, MD
Associate Chief, Paediatric 
American College of Radiology Institute for Radiologic Pathology (AIRP)
Silver Spring, MD

Dr. Chung is Radiologist-in-Chief at Nationwide Children’s Hospital in Columbus, Ohio. A native of Washington, DC she graduated from Georgetown University and Georgetown University School of Medicine. She completed radiology residency at Tripler Army Medical Center in Honolulu, Hawaii followed by a fellowship in Pediatric Radiology at the Children’s Hospital Boston.  She retired from the United States Army, where she reached the rank of colonel.

She is an Adjunct Associate Professor of Radiology and Radiological Sciences at the Uniformed Services University of the Health Sciences (USU). At USU she served as the president of the Faculty Senate. During the merger of Walter Reed Army Medical center and National Naval Medical Center to form Walter Reed National Military Medical Center, she served as the Integrated Chief of Diagnostic Radiology. She also served as the Pediatric Section Chief at the American Institute for Radiologic Pathology/Armed Forces Institute of Pathology from 2005 to 2019 and continues to teach in the radiologic pathology course attended by almost all radiology residents in the US and Canada as well as trainees and practicing radiologists in 28 different countries.

She has lectured at national professional society meetings and on pediatric radiology-pathology correlation in France, Austria, Portugal, Spain, Germany, the Netherlands, Canada, Brazil, Myanmar, and Thailand.

Aletta Ann Frazier, MD
Chief, Cardiothoracic Imaging
Biomedical Illustrator American College of Radiology Insititute for Radiologic Pathology (AIRP) Silver Spring, MD

For almost three decades Dr. Aletta Ann Frazier has combined a career in academic radiology with collaborative radiologic-pathology research and medical illustration.  She is Professor of Diagnostic Radiology and Nuclear Medicine at the University of Maryland School of Medicine, and Section Chief of Cardiothoracic Radiology at the AIRP (American College of Radiology Institute for Radiologic Pathology). 

Dr. Frazier is dedicated to resident education and has written extensively and lectured worldwide on topics of thoracic and cardiac radiology.  She has collaborated with the World Health Organization, the International Association for the Study of Lung Cancer, the U.S. Army Borden Institute, the International Thymic Malignancy Interest Group, the Armed Forces Institute of Pathology, and the Joint Pathology Center of the National Capital Medical Region.

She is also a widely published medical illustrator and an active member of the Smithsonian Chapter of the Guild of Natural Science Illustrators. The spectrum of her artwork comprises anatomy, embryology, pathophysiology, trauma, and neoplasia. These illustrations appear in journals, textbooks, educational software, medical websites, oncologic staging manuals, and surgical atlases.