Mary Scanlon, MD, FACR
Mary Helene Scanlon, MD, FACR, is a Clinical Professor of Radiology. She has been program director since 2006, the same year she won the Wallace T. Miller Sr. Teaching Award.
Mary Helene Scanlon, MD FACR, is a Clinical Professor of Radiology at Penn Medicine and the Vice Chair of Education. She divides her clinical practice between the Division of Neuroradiology at Penn Medicine and the Department of Radiology of the Philadelphia Veterans Affairs Medical Center. Her subspecialty within Neuroradiology is Head and Neck. She has been the program director for Diagnostic Radiology since 2006, the same year she won the Wallace T. Miller Sr. Teaching Award.
Dr. Scanlon’s research interests center on radiology education and new ways to reach Gen Z and Millennials.
She is passionate about organizational and political activism:
- She is the Past President of the Philadelphia Roentgen Ray Society and Pennsylvania Radiological Society. She was the honored radiologist by both societies.
- She has served as faculty liaison to the PRS- RFS, and MSS sections since 2015.
- She is the Past President of APDR (Association of Program Directors in Radiology) and APDR Councilor to ACR. She chaired a national task force on how to ensure that resident training meets the procedural needs of the populations we serve. The voice of the TF was influential in changes made by ABR and ACGME in terms of both testing and tracking procedures expected of a general radiologist that are in place today .
- She is currently a board member and Treasurer for ACR’s RadPac.
- She was named 2020 ACR Advocate of the Year.
- In 2015, a yearly RadPac Achievement award was named in her honor.
- She received the 2026 APDR Achievement Award at the March 2026 AAR meeting in Atlanta.
Susan Shamimi-Noori, MD, MSEd, FSIR
Susan Shamimi-Noori, MD, MSEd, FSIR is a Professor of Clinical Radiology. She has served as Program Director since 2019 and Associate Program Director since 2020 and is deeply involved in medical education.
Susan Shamimi-Noori, MD, MSEd, FSIR is a Professor of Clinical Radiology. She completed her Diagnostic Radiology residency here at Penn Medicine. Subsequently, she graduated from the Interventional Radiology Fellowship Program at Northwestern University. Her main clinical practice is in the Interventional Radiology Division at the Hospital of the University of Pennsylvania
Dr. Shamimi-Noori has many clinical interests and is passionate about education:
- Her clinical niches include interventional oncology, women’s interventions and management of patients with Hereditary Hemorrhagic Telangiectasia. From a research standpoint, she is involved in multiple clinical trials focusing on interventional oncology.
- Dr. Shamimi-Noori serves as Program Director for the Integrated and Independent Interventional Radiology Residency Programs since 2019 and Associate Program Director for the Diagnostic Radiology Residency Program since 2020.
- Dr. Shamimi-Noori is actively involved in mentoring the Perelman School of Medicine Interventional Radiology Interest Group. She is also a founding member and faculty advisor for the Penn Women in Radiology group.
Neil Harrison, MD
Neil Harrison, MD completed training at Penn and is passionate about teaching residents. He chairs IR residency and visiting student selection committees.
Neil Harrison, MD, is an Assistant Professor of Clinical Radiology in the Division of Interventional Radiology at Pennsylvania Hospital. He completed his diagnostic and interventional radiology training at The Hospital of the University of Pennsylvania, acting as chief during his IR training.
Neil is passionate about medical education, quality improvement, and patient care. He serves as Associate Program Director of the Integrated IR Residency, the chair of both the Integrated IR Residency and the Visiting Medical Student IR Clerkship Selection Committees, and the Medical Director of the Venous Access Team at Pennsylvania Hospital. His clinical and research interests are broad and include minimally invasive therapies for various cancers, uterine fibroids, and joint pain.
Jillian Lazor, MD
Jillian Lazor, MD is an Associate Professor of Clinical Radiology in the neuroradiology and nuclear radiology divisions and serves as Clinical Director of Neuroradiology at Pennsylvania Hospital.
Jillian Lazor, MD, is an Associate Professor of Clinical Radiology. She completed her diagnostic radiology residency at the Hospital of the University of Pennsylvania, while also completing the University of Pennsylvania 16-month integrated nuclear radiology fellowship and serving as radiology chief resident. She then completed a two-year neuroradiology fellowship at the Hospital of the University of Pennsylvania, with a subspecialty concentration in head and neck imaging.
Dr. Lazor is board certified by both the American Board of Nuclear Medicine and American Board of Radiology. Her clinical practice is in the neuroradiology and nuclear radiology divisions at the Hospital of the University of Pennsylvania, with a particular interest in head and neck imaging. In addition to serving as Associate Program Director for the diagnostic radiology residency, Jillian is also the Clinical Director of Neuroradiology at Pennsylvania Hospital.
Jillian has many interests:
- Her clinical and research interests center on multi-modality head and neck oncologic imaging, including MRI and molecular imaging.
- She is committed to resident and fellow education and was awarded Teacher of the Year for the Pennsylvania Hospital Radiology Residency in 2019, and the Wallace T. Miller, Sr. Award for Excellence in Resident Teaching and Neuroradiology Fellowship teaching awards in 2023.
Sophia R. O’Brien, MD MSEd
Sophia R. O'Brien, MD, MSEd is Director of the Penn Radiology Residency Coaching-for-Learning program, co-Director of the TEACH track, and co-Leader of the Women in Radiology Group. She is also the co-Academic Director for the Medical Education Research Block of Penn’s MSEd Program. .
Sophia R. O'Brien, MD, MSEd is an Associate Professor of Clinical Radiology in the Divisions of Nuclear Medicine and Breast Imaging. She completed her Diagnostic Radiology residency, integrated Nuclear Radiology Fellowship, Breast Imaging Fellowship, and Master’s of Medical Education at Penn. She is Director of the Penn Radiology Residency Coaching-for-Learning program, co-Director of the TEACH track, and co-Leader of the Women in Radiology Group. She is also the co-Academic Director for the Medical Education Research Block of Penn’s MSEd Program and co-Director for the inaugural PSOM/CHOP Medical Education Conference. Dr. O’Brien serves as an associate editor for Academic Radiology and Clinical Imaging and is the incoming Secretary for the SNMMI Greater New York Chapter for 2026-2027.
Dr. O'Brien's clinical expertise includes Fluoroestradiol PET/CT and Radionuclide Therapy and her research focuses on medical education, specifically feedback interactions. She was named an SNMMI “Ones to Watch” in 2023, and awarded the Penn Nuclear Medicine Teacher of the Year in 2023 and 2026, Penn Women in Radiology POWeRS award in 2026, and Penn Excellence in Medical Student Radiology Education Award in 2026.
Shilpa Reddy, MD
Shilpa N. Reddy, MD, is an Associate Professor of Clinical Radiology. Dr. Reddy supports the Interventional Radiology Residency Program as Associate Program Director and is passionate about education and resident mentorship.
Shilpa N. Reddy, MD, is an Associate Professor of Clinical Radiology. She completed her Diagnostic Radiology residency at Albert Einstein Medical Center. Subsequently, she graduated from the Interventional Radiology fellowship program here at Penn Medicine. She divides her Interventional Radiology practice between the Hospital of the University of Pennsylvania and the Philadelphia Veterans Affairs Medical Center.
Dr. Reddy supports the Interventional Radiology Residency Program as Associate Program Director. She is passionate about education and resident mentorship, and received the Scott O. Trerotola 2020 Award for Excellence in IR Teaching.
She has many clinical interests. Two of her clinical niches include peripheral arterial disease and interventional oncology. Her research interests have spanned many topics including venous access devices, dialysis interventions, and peripheral arterial disease.
Matthew Nazarian, MD
Matthew Nazarian, MD is an Assistant Professor of Clinical Radiology. He completed diagnostic radiology residency at NYU Grossman School of Medicine and fellowship at the Hospital of the University of Pennsylvania before joining the faculty in the Abdominal Imaging Division.
Matthew Nazarian, MD is an Assistant Professor of Clinical Radiology. He completed diagnostic radiology residency at NYU Grossman School of Medicine and fellowship at the Hospital of the University of Pennsylvania before joining the faculty in the Abdominal Imaging Division.
Before his current role, he served as Assistant Program Director for the Abdominal Imaging Fellowship. He has been recognized with the Excellence in Teaching by a Radiology Fellow Award in 2023 and the Outstanding Faculty Team Player Award in 2026.
His research interests include Imaging of Inflammatory Bowel Disease, advanced GI imaging techniques, and Spectral and Photon Counting CT.
Evan Siegelman, MD
Evan Siegelman, MD is Professor of Radiology and Section Chief for Body MRI and has chaired the selection committee since 2002.
Evan Siegelman, MD, is professor of Radiology in the Abdominal Imaging Division at Penn Medicine. He has chaired the Resident Selection Committee since 2002.
- He has won the Wallace T. Miller Sr. Teaching Award more than any single faculty member in the history of Diagnostic Radiology at Penn.
- He is the "Jedi Master" of teaching the principles and practice of Body MR.
- He has published an early definitive textbook on Body MR and has lectured regionally, nationally and internationally on applications of Body MR.
- He is currently a member of the O-RADS (ovarian reporting and data system) cCommittee and a former member of the LI-RADS working group.
Abass Noor, MD
Abass Noor, MD is an Assistant Professor of Clinical Radiology.
Dr. Noor is an attending physician in the Departments of Radiology at the University of Pennsylvania and Children's Hospital of Philadelphia. He completed his undergraduate education at Macalester College (St. Paul, MN) and received his medical degree from the Alpert Medical School of Brown University (Providence, RI). Given his experiences as a refugee from Somalia, Dr. Noor has long held a passion for working toward a more equitable future for low and middle-income countries (LMICs). His current interests are primarily in medical education and in implementing sustainable radiology services in resource-limited areas of the world.
Recent Global Health Projects
Dr. Noor is the Director of Global Radiology Outreach & Education at the Children's Hospital of Philadelphia and the Director of the Health Equity Leadership Track in the radiology residency program of the University of Pennsylvania.
He also serves as the Program Manager for RAD-AID Botswana, an international organization seeking to increase and improve radiology in LMICs.
Ansar Vance, MD, MSEd
Ansar Z. Vance, MD MSEd, is an Associate Professor of Clinical Radiology in the Division of Interventional Radiology at Penn Medicine. He is Chair of the Independent Interventional Radiology Residency Selection Committee. Beyond his clinical interests, he has a passion for medical education and mentorship at all levels.
- Active Physician, Penn Presbyterian Medical Center – Department of Radiology, Division Interventional Radiology
- Attending, Philadelphia VA Medical Center - Department of Radiology, Division of Interventional Radiology
- Attending Physician, Hospital of the University of Pennsylvania – Department of Radiology, Division of Interventional Radiology
- Physician Leader, Clinical Effectiveness Team, Penn Presbyterian Medical Center - Department of Radiology, Division of Interventional Radiology
- Active Physician, Pennsylvania Hospital - Department of Radiology, Division of Interventional Radiology