Expand Content

Thomas Callahan, IV, MD


Thomas Callahan, IV, MD
Department: Cardiovascular Medicine
Location: Cleveland Clinic Main Campus
Mail Code J2-2
9500 Euclid Avenue
Cleveland, OH 44195
Type of Doctor:
Adults Only

Biographical Sketch

Dr. Thomas Callahan is Staff Physician and Director of Inpatient Services in the Section of Pacing and Electrophysiology of the Sydell and Arnold Miller Family Heart & Vascular Institute at Cleveland Clinic. His office is located on the main campus. He came to the Cleveland Clinic in 2003 as a Fellow in Cardiovascular Medicine and subsequently also completed a Fellowship in Cardiac Electrophysiology and Pacing. He is board certified in Clinical Cardiac Electrophysiology, Cardiovascular Disease,Internal Medicine, and Nuclear Cardiology. His specialty areas include: atrial and ventricular arrhythmias including atrial fibrillation and catheter ablation for treatment of these arrhythmias including pulmonary vein isolation. He also specializes in device therapy including device and lead extraction and the implantation of pacemakers, implantable defibrillators (ICDs), and biventricular pacemakers and ICDs.  He currently serves as associate program director for the cardiology and electrophysiology fellowships.

Dr. Callahan is a graduate of Ohio's Oberlin College. He received a Master's Degree from the University of Michigan, and then continued his education, earning a medical degree from Eastern Virginia Medical School, Norfolk, VA. Prior to joining the Cleveland Clinic, Dr. Callahan served as resident and then chief resident in Internal Medicine at the Hospital of the University of Pennsylvania. He has received several honors and awards, including the Dawson Award for Clinical Excellence and Humanism.

Dr. Callahan has conducted research in his areas of specialization that has been published in leading medical journals. He is a member of the Heart Rhythm Society, American College of Cardiology, and the American Medical Association.

Education & Fellowships

Fellowship - Cleveland Clinic
Cleveland, OH USA
Fellowship - Cleveland Clinic
Cardiovascular Medicine
Cleveland, OH USA
Residency - Hospital of the University of Pennsylvania
Internal Medicine
Philadelphia, PA USA
Internship - Hospital of The University of Pennsylvania
Internal Medicine
Philadelphia, PA USA
Medical School - Eastern Virginia Medical School
Norfolk, VA USA
Graduate - University of Michigan
Ann Arbor, MI USA
Undergraduate - Oberlin College
Oberlin, OH USA


  • Internal Medicine- Clinical Cardiac Electrophysiology
  • Internal Medicine- Cardiovascular Disease
  • Certification Board of Nuclear Cardiology

Specialty Interests

Abnormal Heart Rhythm, Sudden Cardiac Death, Supraventricular Tachycardia, Ventricular Tachycardia, Wolff-Parkinson-White Syndrome, Biventricular Pacemaker, Catheter Ablation, Implantable Cardioverter Defibrillator, Lead Extraction, Radiofrequency ablation

Specialty in Diseases and Conditions

Industry Relationships

Cleveland Clinic physicians and scientists may collaborate with the pharmaceutical or medical device industries to help develop medical breakthroughs or provide medical expertise or education. Cleveland Clinic strives to make scientific advances that will benefit patient care and support outside relationships that promise public benefit. In order for the discoveries of Cleveland Clinic physicians' and scientists' laboratories and investigations to benefit the public, these discoveries must be commercialized in partnership with industry. As experts in their fields, Cleveland Clinic physicians and scientists are often sought after by industry to consult, provide expertise and education.

To assure professional and commercial integrity in such matters, Cleveland Clinic maintains a program that reviews these collaborations and, when appropriate, puts measures in place to minimize bias that may result from ties to industry. The Cleveland Clinic publicly discloses the names of companies when (i) its physicians/scientists receive $5,000 or more per year (or, in rare cases, equity or stock options) for speaking and consulting, (ii) its physicians/scientists serve as a fiduciary, (iii) its physicians/scientists receive or have the right to receive royalties or (iv) its physicians/scientists hold any equity interest for the physician's/scientist's role as inventor, discoverer, developer, founder or consultant.* In publicly disclosing this information, the Cleveland Clinic tries to provide information as accurately as possible about its physicians' and scientists' connections with industry.

As of 5/20/2014, Dr. Callahan, IV has reported no financial relationship with industry that is applicable to this listing. In general, patients should feel free to contact their doctor about any of the relationships and how the relationships are overseen by the Cleveland Clinic. To learn more about the Cleveland Clinic's policies on collaborations with industry and innovation management, go to our Integrity in Innovation page.

Public Health Service-Reportable Financial Conflicts of Interest. Cleveland Clinic scientists and physicians engage in basic, translational and clinical research activities, working to solve health problems, enhance patient care and improve quality of life for patients. Interactions with industry are essential to bringing the researchers’ discoveries to the public, but can present the potential for conflicts of interest related to their research activities. Click here to view a listing of instances where Cleveland Clinic has identified a Public Health Service (PHS)-Reportable Financial Conflict of Interest and has put measures in place to ensure that, to the extent possible, the design, conduct and reporting of the research is free from bias.

* Cleveland Clinic physicians and scientists subscribe to the guidance presented in the PhRMA Code on Interactions with Healthcare Professionals and the AdvaMed Code of Ethics on Interactions with Health Care Professionals. As such, gifts of substantial value are generally prohibited.

Languages Spoken

  • English