MyChart Patient Portal; Search Our Site; ER Wait Time | Door To Provider: Denville: ... If this is a life threatening emergency, call 911. Find A Provider Gregg E. Zimmerman MD. Gregg E. Zimmerman, MD. Gregg E. Zimmerman, MD. Primary Specialty: Urology. Gender: Male Locations. Garden State Urology 23 Pocono Road, Suite 100 Denville, NJ 07834 ....