The Kahn Dermatology Team


Hirshel Kahn, M.D.

hoto Credit: tbd

Hirshel Kahn, MD is a native of Johannesburg, South Africa. After graduating from a six-year medical school, Dr. Kahn completed a residency in Pathology at Mount Sinai Medical Center in New York City. Dr. Kahn went on to complete a fellowship in Dermatopathology and a then a second residency in Dermatology at Mount Sinai Medical Center where he served as Chief Resident.

Dr. Kahn is certified by the American Board of Pathology, the American Board of Dermatology and by the American Board of Dermatology and Pathology with a special qualification in Dermatopathology. In addition to being a Fellow of the American Academy of Dermatology, Dr. Kahn is a member of the American Society of Clinical Pathologists and the United States and Canadian Academy of Pathology.

Dr. Kahn is widely published and remains on staff as an Assistant Clinical Professor at Mount Sinai Medical Center in New York City where he teaches in the residency training program. His special interests include skin cancer, psoriasis and hair loss. He also has extensive experience in Botox and Dermal Fillers.


Helen Radoszycki, M.D.

Photo Credit: Mitya Ku

Dr. Radoszycki joined our staff in January of 2010. She received her medical degree summa cum laude from the State University of New York Health Science Center at Brooklyn and completed her undergraduate degree summa cum laude from The State University of New York at Albany. Following an internship in internal medicine at Lenox Hill Hospital, Dr. Radoszycki served as resident and chief resident in dermatology at the State University of New York Health Science Center at Brooklyn.

She has been involved in numerous research projects and is the recipient of a number of academic awards and honors. Dr. Radoszycki is a Diplomat of the American Board of Dermatology and a Fellow of the American Academy of Dermatology. She enjoys the medical, surgical and cosmetic aspects of dermatology. Her special interests include treating acne in both adults and adolescents, eczema, psoriasis and skin cancer screenings.


Derek Chan, M.D., PhD

Dr. Chan received his A.B. in Biochemical Sciences with Honors from Harvard. He received a joint M.D. and Ph.D. from Boston University, where he also held 1 of 10 national fellowships from the American Academy of Allergy, Asthma & Immunology (AAAAI) and was also a recipient of the annual Tai Foundation Scholarship for Merit & Achievement at Boston University School of Medicine. At Boston University, his research focused on the development of innovative therapies to target specific cancer cells using recombinant fusion proteins. After medical school, he was the recipient of an NIH-funded training grant under the mentorship of Kevin Cooper, MD, focusing upon mechanisms of psoriasis and also conducted clinical studies regarding cutaneous lymphomas. He is a reviewer for Archives of Dermatology and Clinical Cancer Research and has been nationally recognized by the AAAAI and the National Psoriasis Foundation, the Cutaneous Lymphoma Foundation, and the International Society for Cutaneous Lymphomas. He has spoken at several national and international meetings, has received NIH grant funding, and has published in several key peer-reviewed journals, including JAMA Dermatology and the Journal of the American Academy of Dermatology. A native of upstate New York, Dr. Chan moved to the Midwest to complete his residency in dermatology at Ohio State University before returning to the East Coast. He maintains interests in psoriasis, cutaneous neoplasms, and lasers/cosmetic dermatology and currently resides in Manhattan.