Joshua Zeichner, MD - Cosmetic and Medical Dermatology Dr. Joshua Zeichner is the Director of Cosmetic and Clinical Research in the Dermatology Department at Mt. Sinai Hospital in New York City. Dr. Zeichner's specialty is the treatment of acne as well as cosmetic rejuvenation of the aging face. Zeichnerdermatology.com~Site InfoWhoisTrace RouteRBL Check