Dr. Greenberg is the founder and Director of the East Bay Psoriasis Treatment Center, a dermatology private practice with locations in San Ramon and Livermore, California. He is an active staff member of the San Ramon Regional Medical Center and the John Muir Medical Center. He also serves as a consulting staff member of the Valley Care Medical Center in Pleasanton and Livermore, California.

Dr. Greenberg earned his medical degree from the State University of New York Downstate Medical Center in Brooklyn, New York. He completed an internship in internal medicine at the University of California Los Angeles Medical Center and a residency in dermatology at the University of California San Francisco Medical Center.

Dr. Greenberg has been involved in many clinical research studies on treatments for various skin conditions, including plaque psoriasis, actinic keratosis, eczema, acne, melasma, rosacea, and dermatosis.