Patient focused, community oriented, conveniently located and equipped with technology that rivals the nations most prestigious healthcare systems, HackensackUMC Mountainside offers a comprehensive and growing array of services delivered by caring and highly skilled medical professionals. Were proud of the therapeutic and administrative upgrades we have made. Were the convenient, friendly community hospital that delivers the quality care, medical excellence and technology on which you can depend. HackensackUMC Mountainside has been serving Montclair and its surrounding New Jersey communities since 1891. The physicians, nurses and volunteers who are a part of the Mountainside family are also your friends and neighbors. Were your community, your hospital and your team, working hard on your behalf. Medical doctor, endocrinology, internal medicine Medical doctor, obstetrics & gynecology.