Newswise — MONTCLAIR, New Jersey (August 12, 2020) – A new chief executive officer (CEO) was named today for Hackensack Meridian Mountainside Medical Center. Tim O’Brien, formerly the hospital’s chief operating officer (COO), will transition from his role as interim CEO to lead the hospital. O’Brien replaces John Fromhold who recently retired. 

O’Brien served as Mountainside’s COO since 2017 and leads the COVID-19 preparedness operations. During his tenure, he led program development efforts in neurosciences, overseeing the addition of advanced neuroendovascular services. O’Brien has implemented significant operational improvements to enhance quality and service to patients and served as the executive lead for the successful implementation of the Epic electronic health records system. 

“Tim has proven himself to be an exceptional executive during his time as the COO and as interim CEO. He has a deep knowledge of Mountainside operations and his collaborative style will make this leadership transition seamless,” said Matt Maxfield, president of the Ardent Health Services Americas division. “After an extensive national search, we were very pleased to find the top candidate among our existing leaders.” 

“Tim brings a wealth of experience in healthcare to this new role and a deep understanding of our commitment to providing high-quality compassionate care in the community,’’ said Robert C. Garrett, CEO of Hackensack Meridian Health. “Tim will no doubt continue to contribute to our mission to transform health care.’’ 

O’Brien previously served as COO at North Suburban Medical Center in Thornton, Colorado, and was the interim COO and assistant administrator at Westside Regional Medical Center in Plantation, Florida. He started his career as a strategic and operational business consultant for hospitals and other healthcare organizations.  

A fellow of the American College of Healthcare Executives, O’Brien earned a master of business administration from the Vanderbilt University Owen Graduate School of Management in Nashville, Tennessee, and a bachelor of science in public health, health policy, and administration from the University of North Carolina in Chapel Hill.


About Mountainside Medical Center

Mountainside Medical Center has been serving Montclair and its surrounding New Jersey communities since 1891. The hospital provides patients immediate access to innovative and effective treatment alternatives at specialized centers within the hospital that focus on imaging, women’s health, cancer care, surgery, obesity, stroke and chronic kidney disease. Mountainside Medical Center is designated as a Primary Stroke Center by the NJ State Department of Health and Senior Services, and is one of only a few community hospitals licensed by the State to perform emergency cardiac angioplasty. To learn more about Mountainside Medical Center visit