Thomas O’Neill, M.D., is Assistant Professor of Radiology at UT Southwestern Medical Center and a member of its Neuroradiology Division.

Dr. O’Neill holds a bachelor’s degree in biochemistry from the University of Texas at Austin. He earned his medical degree at the University of Texas Medical School at Houston, and completed his radiology residency training at Texas Tech University Health Sciences Center in Lubbock. He then received advanced training through a fellowship in neuroradiology at UT Southwestern.

Dr. O'Neill joined the faculty in 2015, and currently serves as the Radiology Informatics Service Chief for Parkland Hospital.

Dr. O’Neill focuses his research on functional magnetic resonance imaging (MRI) and imaging informatics, and has published several original research articles in peer-reviewed journals.

At UT Southwestern, Dr. O’Neill’s commitment to medical education is demonstrated by his participation in the Radiology Residency Program Selection Committee, Resident Onboarding Committee, and Neuroradiology Fellowship Program Evaluation Committee. His interest in imaging informatics is evidenced by his involvement in the Radiology Informatics Workgroup, PACS (Picture Archiving and Communications System) Governance Committee, and the Office 365 Governance Group. He also serves on the Spine Service Committee.

Dr. O’Neill is a member of multiple national and international professional societies, including the Radiological Society of North America, American College of Radiology, American Society of Neuroradiology, Organization for Human Brain Mapping, Society for Imaging Informatics in Medicine, and the Texas Medical Association.

His editorial activity includes serving as a reviewer for the American Journal of Neuroradiology.


Medical School
UT Health Science Center at Houston (2009)
Atlanta Medical Center (2010), Surgery
Texas Tech University Health Science Center Paul L. Foster School of Medicine (2014), Diagnostic Radiology
UT Southwestern Medical Center (2015), Neuroradiology

Research Interest

  • Functional MRI
  • Informatics

Honors & Awards

  • Chief Resident
    Texas Tech University Health Sciences Center (2012-2013)

Professional Associations/Affiliations

  • American College of Radiology
  • American Society of Neuroradiology
  • Organization for Human Brain Mapping
  • Radiological Society of North America
  • Society for Imaging Informatics in Medicine
  • Texas Medical Association