Physician Photo

Thomas D. Horn, MD

Vice Chair, Department of Dermatology

Medical Director, MGPO Dermatopathology Associates

Clinical Professor of Dermatology & Pathology, Harvard Medical School

Thomas Horn, MD, MBA, is a recognized expert in the fields of dermatology and pathology.

  • Phone: 617-726-2914
Department of Pathology
Department of Dermatology
Clinical Interests
Dermatology (general)
Graft-versus-host disease
Clinicopathologic correlation
HIV dermatology
Boston: Massachusetts General Hospital
Newton: Newton-Wellesley Hospital
Medical Education
MD, University of Virginia Medical School
Residency, University of Maryland Baltimore
Fellowship, Johns Hopkins University School of Medicine
Fellowship, University of Virginia Medical School
Board Certifications
Dermatology, American Board of Dermatology
Dermatopathology, American Board of Dermatology
Foreign Languages
Patient Age Group
Accepting New Patients
Accepting New Patients


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


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.

Dermatology Associates
50 Staniford Street
2nd Floor
Boston, MA 02114-2517

Phone: 617-726-2914
Fax: 617-726-7768

Pathology Associates
55 Fruit Street
Boston, MA 02114-2696

Phone: 617-726-2967

MGH Dermatopathology Center
2 Wells Avenue
Newton, MA 02459-3208

Phone: 855-644-3376
Fax: 617-658-9399