Leadership Team

Justine E. DeFronzo, MBA, BSN, RN, President

Justine DeFronzo

Justine DeFronzo is an accomplished health care executive who comes to New England Sinai Hospital with over 20 years of progressive achievement in corporate and community hospital settings. She is a highly visible leader with a passion for innovation and generating positive results in a collaborative professional environment with an emphasis on high-quality patient care and safety.

Before joining the New England Sinai Hospital family, DeFronzo served as chief nursing officer and chief operating officer at Carney Hospital and served as Norwood Hospital’s vice president and chief nursing officer. She came to Norwood Hospital after serving as the associate chief nursing officer at Emerson Hospital in Concord, Massachusetts, where she was responsible for inpatient medical surgical and telemetry services, pediatrics, critical care unit, transitional care unit, behavioral health unit, nurse staffing office, dialysis, and the administrative nursing supervisors. DeFronzo is also experienced in emergency services, having served as director of emergency services at Emerson Hospital and previously in the same role at Heywood Hospital in Gardner, Massachusetts.

DeFronzo spent the early part of her career at Lowell General Hospital, serving in a variety of nursing roles with progressive responsibility, including pediatrics, emergency department, administrative nursing supervisor, and clinical nurse manager – pediatrics and special care nursery. She was instrumental in achieving Magnet designation for the hospital.

DeFronzo received both her Master of Business Administration and Bachelor of Science in Nursing at Rivier University and is a fellow of the MHA Leadership College. In addition, she is a member of the American College of Healthcare Executives. DeFronzo is dedicated to community involvement and volunteerism and has been on the Board of Directors for the Boys & Girls Club of Greater Lowell for several years and served as Chair of the Board of Directors for four years.

Vishal Tiwari, MD, Vice President, Medical Affairs of LTAC Hospital Medicine and TCU

Dr. Vishal Tiwari  Dr. Vishal Tiwari, is Vice President of Medical Affairs of LTAC Hospital Medicine and TCU. In his role as Medical Director of Hospital Medicine at NESH, Dr. Tiwari will oversee the daily operations of the hospital medicine program and work closely with our regional CMO, nursing, and administrative leadership to improve quality, safety and patient experience. He will continue to serve in his leadership role at Good Samaritan and improve collaboration between the two hospitals.

Dr. Tiwari earned his medical degree from S. N. Medical College, Agra, India and completed his residency in Internal Medicine at Unity Health, Rochester, NY. He joined Baystate Health as an Attending in the Hospital Medicine program in 2009. During his tenure at Baystate, Dr. Tiwari he held various leadership roles including a dual role as Assistant Professor of Medicine, University of Massachusetts and Senior Medical Director, Health New England – a health plan under Baystate Health. He joined Steward Health Care over a year ago as the Medical Director at Holy Family Hospital and later joined the Good Samaritan leadership team.

Dr. Tiwari graduated with a Master of Healthcare Delivery Science (MHCDS) from Tuck School of Business, Dartmouth College, NH in January 2022.


Jean Ivil, MSN, RN, RRT, CNE, Chief Nursing Officer and Vice President, Patient Care Services

JeJean Ivil, MSN, RN, Chief Nursing Officer and VP of Patient Care Servicesan is an accomplished nursing leader who brings a wealth of knowledge and experience to her role. She began her career in health care at New England Sinai in 1993 as a respiratory therapist and achieved her Associate's Degree in Nursing from Quincy College in 1999. She continued her education and earned her BSN from Curry College in 2005 and her MSN from Framingham State in 2012.

Jean spent a total of 18 years in numerous roles at New England Sinai, including evening coordinator/floor nurse, clinical educator, assistant nurse manager and case manager. She transitioned to Signature Healthcare in Brockton where she expanded her repertoire in various leadership roles such as director of simulation, director of population health, director of nursing, and, most recently, director of patient experience. Jean is a certified nurse educator and has maintained her registered nurse and respiratory therapy licenses.

Gregory Malloy, MD, Director of Physical Medicine and Rehabilitation

NESH Dr. Gregory MalloyDr. Gregory Malloy brings a stellar record of leadership in physical medicine/rehabilitation as well as a specialty in stroke therapy to his role at New England Sinai Hospital. Prior to joining New England Sinai, he was a physiatrist at Spaulding Rehabilitation Hospital where he focused on stoke therapy. 

Dr. Malloy earned his bachelor's degree from Amherst College in Massachusetts and his medical degree from New York Medical College in Valhalla. He completed his medical training in physical medicine and rehabilitation at the University of Washington in Seattle.

Elaine Noonan, MBA, CPA, Chief Financial Officer

Elaine Noonan

Elaine Noonan, MBA, CPA, has more than 30 years of experience working in finance, specifically in the health care industry.

Before joining the hospital’s leadership team, Noonan was the finance director at New England Sinai’s sister hospital Holy Family Hospital in Methuen, Massachusetts. Over the years, she held various financial positions at Southcoast Health System, Norwood Hospital and Brigham and Women’s Physician Organization. Noonan earned a Bachelor of Science in accounting from Stonehill College in North Easton, Massachusetts and a Master of Business Administration from the University of Albany in New York.

Noonan is a certified public accountant and certified internal auditor and is a member of the American Institute of Certified Public Accountants and the Institute of Internal Auditors.