Mountainside Medical Center has been serving Montclair and surrounding New Jersey communities since 1891. In collaboration with its joint venture partners, Ardent Health Services and Hackensack Meridian Health, Mountainside Medical Center is well positioned for future growth and continued excellence in providing care to Essex County and surrounding regions. With the addition of innovative capabilities, Mountainside Medical Center’s respected medical and community reputation has gained even more strength. Ongoing collaboration with physicians and community leaders enables Mountainside Medical Center team to bring the latest medical programs, technology and patient-focused care to local communities.