KDL Pathologists

Experience You Can Trust

Recognized experts in hard-to-diagnose skin lesions, KDL dermatopathologists have an impeccable reputation nationwide for delivering high-quality, physician centered, and patient focused service to our clients and their patients. KDL receives requests for consultation from other physicians and laboratories nationwide. KDL pathologists have teaching appointments at major medical centers and maintain an active research program, advancing the diagnosis and treatment of melanoma and other skin disorders.

KDL Pathologists

Dr. Joshua Gapp is board certified in anatomic and clinical pathology and dermatopathology. Dr. Gapp received his M.D. from the University of North Dakota School of Medicine. He completed both his fellowship in dermatopathology and his residency in anatomic and clinical pathology at the Saint Louis University School of Medicine, where he served as chief resident in anatomic and clinical pathology. He also received an MBA from Vanderbilt University. With his combined love of medicine and business, Dr. Gapp became the owner of KDL Pathology in October 2016. When he’s not at the lab, Josh enjoys spending time at home with his wife, four kids, and beloved pet bird, Lucy. The Gapps love living in Knoxville and enjoy all the outdoor activities this area has to offer.

Dr. Jamshed Haq is board certified by the American Board of Pathology in both Anatomic and Clinical Pathology.  Dr. Haq attended medical school at King Edward Medical College in Pakistan and completed a residency in internal medicine at the Services Hospital in Lahore, Pakistan. He completed his medical education with an internship at Petersburg General Hospital in Petersburg, VA and received his pathology training at the Medical College of Virginia in Richmond, VA and Henry Ford Hospital in Detroit, MI.


DrTimothy Powers is board certified in Anatomic Pathology and Ophthalmology by the American Boards of Pathology and Ophthalmology. Dr. Powers graduated from the Quillen-Dishner College of Medicine. He received his pathology training at the University of Tennessee Medical Center and completed a Fellowship in Ophthalmic Pathology at the Medical University of South Carolina. He then completed his residency in Ophthalmology at the Medical University of South Carolina.


Consulting Dermatopathologist

Martin Mihm, Jr. M.D. Dr. Mihm is considered an international expert in the field of pigmented lesions, lymphoma and cutaneous inflammatory disease. Dr. Mihm is currently the Director of the Melanoma Program at Brigham & Women’s Hospital and the Associate Director of the Melanoma Program at Dana Farber Cancer Institute, both in Boston, MA. Dr. Mihm received his M.D. from the University of Pittsburgh Medical School. He completed his dermatology residency and fellowship in pathology at the Harvard Medical School and Massachusetts General Hospital. Dr. Mihm is a Clinical Professor of Pathology at Harvard Medical School and Albany Medical College of NY as well as a consultant at Beth Israel Hospital in Boston, MA. Dr. Mihm is a contributing editor of ‘American Journal of Dermatopathology’, ‘Journal of Cutaneous Pathology’, ‘Surgical Pathology’, and Fitzpatrick’s ‘Journal of Clinical Dermatology’. Dr. Mihm is the author of more than 550 publications, including books, articles, and chapters.