About Thomas Horn, MD

Dr. Horn is a leader in advancing the clinical, research, and educational aspects of the fields of dermatology and dermatopathology. He is Emeritus Executive Director of the American Board of Dermatology, and Vice Chair of the Department of Dermatology at Massachusetts General Hospital.

Departments, Centers, & Programs:

Clinical Interests:




Dermatology Associates
50 Staniford Street
2nd Floor
Boston, MA 02114-2517
Phone: 617-726-2914
Fax: 617-726-7768

MGPO Dermatopathology Associates
2 Wells Avenue
Newton, MA 02459-3208
Phone: 855-644-3376
Fax: 617-658-9399

Medical Education

  • MD, University Of Virginia
  • MD, University of Virginia School of Medicine
  • Residency, University Of Maryland
  • Residency, University of Maryland Baltimore
  • Residency, University of Maryland Hospital
  • Residency, University Of Virginia
  • Fellowship, Johns Hopkins University
  • Fellowship, Johns Hopkins University School of Medicine
  • Fellowship, The Johns Hopkins Hospital
  • Fellowship, University of Virginia
  • Fellowship, University of Virginia Health System

American Board Certifications

  • Dermatopathology, American Board of Dermatology
  • Dermatology, American Board of Dermatology

Accepted Insurance Plans

Note: This provider may accept more insurance plans than shown; please call the practice to find out if your plan is accepted.


In addition to basic science research on Graft-versus-Host Disease, Dr. Horn recently contributed to the National Institute of Health (NIH) Development Project on Criteria for Clinical Trials in Chronic Graft-versus-Host Disease Consensus Conference of 2014. Conference outcomes include new information from histopathological studies of GVHD in the gut, liver, skin, and oral mucosa and an expanded discussion of GVHD in the lungs and kidneys. 


  • View my most recent publications at PubMed

    Dr. Horn has over 85 articles listed on PubMed. Journals include Nature (Journal of Investigative Dermatology), the Journal of the American Academy of Dermatology, and JAMA Dermatology.