James Daniels, M.D., is an Associate Professor in the Department of Internal Medicine’s Division of Cardiology at UT Southwestern Medical Center.

A specialist in cardiac arrhythmias, he also leads the UT Southwestern’s Pacemaker and Defibrillator Clinic. He joined the UT Southwestern faculty in 2009.

In addition to his patient care responsibilities, Dr. Daniels frequently lectures UT Southwestern’s cardiology, electrophysiology, and internal medicine trainees. His current research interests include MRI-compatible implantable cardiac devices and atrial fibrillation.

Dr. Daniels earned his medical degree at UT Southwestern. He performed both an internal medicine internship and an internal medicine residency at the University of New Mexico Health Sciences Center. He served an additional year as Chief Medical Resident, during which he was responsible for resident education in addition to attending as a faculty physician on the inpatient wards and outpatient clinic.

He then completed two fellowships at UT Southwestern – one in clinical cardiac electrophysiology, the other in cardiovascular diseases. He also holds bachelor’s degrees in cell biology and chemistry, both with distinction and honors, from the University of Kansas.

Dr. Daniels has published a number of peer-reviewed articles and delivered several invited lectures related to cardiac arrhythmias. He serves as an ad hoc reviewer for publications that include the Journal of Cardiovascular ElectrophysiologyJournal of Investigative Medicine, and American Journal of Cardiology.

American Board of Internal Medicine-certified in internal medicine, cardiovascular disease, and clinical cardiac electrophysiology, Dr. Daniels memberships to professional organizations include the American Heart Association, fellow of the American College of Cardiology (FACC), fellow of the Heart Rhythm Society, and the American Medical Association.

Dr. Daniels was included in D Magazine's Best Doctors list for 2021, 2020, and 2018.

He and his wife, a dermatologist, have three children.


Medical School
UT Southwestern Medical School (2001)
University of New Mexico Health Science Center (2004), Internal Medicine
University of New Mexico Health Science Center (2005), Internal Medicine
UT Southwestern Medical Center (2008), Cardiovascular Disease
UT Southwestern Medical Center (2009), Cardiac Electrophysiology

Research Interest

  • Aldosterone antagonism to reduce myocardial fibrosis and arrhythmogenesis
  • Cosmetic pacemaker and defibrillator implantation
  • Reduction of procedural fluoroscopy (X-ray) exposure


Featured Publications LegendFeatured Publications

Honors & Awards

  • Certificate of Recognition
    University of New Mexico Hospital (2005)

Professional Associations/Affiliations

  • American College of Cardiology
  • American Heart Association
  • Heart Rhythm Society