Justine Fenner Biederman
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Justine Fenner Biederman, MD


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About Me

Dr. Justine Fenner is a compassionate Pediatric Dermatologist and Assistant Professor at Mount Sinai, known for her dedication to providing exceptional care to her young patients. Dr. Fenner earned her medical degree from Stony Brook School of Medicine where she was elected to the  Alpha Omega Alpha (AOA) honor society for her academic achievements and to the Gold Foundation for Humanism in Medicine Honor Society for her commitment to compassionate care. She completed her intern year in Pediatrics at Maria Ferrari Children's Hospital where she was recognized for her passion for education with the Gold Humanism Teaching Award. Dr. Fenner pursued her residency in Dermatology at the Icahn School of Medicine at Mount Sinai, where she graduated as chief resident. Guided by her love of children, she pursued a Pediatric Dermatology fellowship at Columbia University, refining her specialized knowledge in the field. Dr. Fenner is delighted to return to Mount Sinai, where she finds immense joy in caring for children and their unique dermatological needs. Her areas of interest include alopecia and acne, as well as inflammatory skin diseases such as eczema, contact dermatitis, and psoriasis. She is dedicated to staying up-to-date with the latest advancements in the field and providing the best possible care to her patients. Outside of medicine, she indulges in her love for all things Disney, baking treats for family and friends and appreciating nature through hiking and gardening.


ASSISTANT PROFESSOR | Dermatology, ASSISTANT PROFESSOR | Pediatrics, General Pediatrics
Hospital Affiliations
  • Mount Sinai Beth Israel
  • Mount Sinai Morningside
  • Mount Sinai Brooklyn
  • Mount Sinai Queens
  • The Mount Sinai Hospital
  • Mount Sinai West