A Legacy of Caring
It’s often said that The Nathaniel Witherell is “a Greenwich gem.” Owned and operated by the Town of Greenwich since 1903, the Witherell, a not-for-profit healthcare facility, is dedicated to providing the highest level of skilled nursing care and quality of life for our seniors. We also offer exceptional short-term rehabilitation and sub-acute post-hospitalization care for all those in need.
We treasure our seniors, some of whom taught in our schools, cared for our sick, were our first responders, business owners, neighbors, and friends. The Nathaniel Witherell is here for the families we serve. We’re here for you, too.
Leadership Team
John Mastronardi
Executive Director
Francis Walsh, MD
Medical Director
Louise Comeau, DNP, MBA, RN
Director of Nursing Services
Margaret Wayne, RN
Assoc. Director of Nursing
Elizabeth Mungai, BSN, RN
Director of Utilization Clinical,
Outcomes & Rehab Services
Ailinh Tu, OTR
Rehabilitation Manager
George Cossifos
Admissions Manager
Justine Vaccaro, LMSW
Director of Social Work
Carissa Ronish
Therapeutic Recreation Director
Stefano Materia
Director of Facilities
The Nathaniel Witherell
Board of Directors
- Laurence B. Simon, Chairman
- Melissa Gibbons
- Christopher Carter
- Paul Hopper
- Nisha Hurst
- Richard Kaplan
- Brad Markowitz
- Nirmal Patel, MD
- Kate Tabner
Awards and Accolades
A U.S. News & World Report “Best Nursing Home - Long-Term Care” 2021-22
Named a Best Nursing Home - Long-term Care again for 2021-22 by U.S. News & World Report, The Nathaniel Witherell is among the top 8% of skilled nursing facilities in the U.S. to receive the distinction. U.S. News gives the designation of Best Nursing Home only to those that satisfy its assessment of the appropriate use of key services and consistent performance in quality measures.
A U.S. News & World Report “Best Nursing Home - Short-Term Rehabilitation" 2021-2022
Named a "Best Nursing Home - Short-Term Rehabilitation" again for 2021-2022 by U.S. News and World Report. The Nathaniel Witherell earned the highest possible ranking which is given only to those that earn top marks for a nursing home's quality of post-acute care for patients recovering from a hospital stay such as after stroke, heart attack, infection or accidental injury.
Low Staff Turnover Rate
The Witherell’s annual nursing staff turnover is 7% compared to an average for nursing homes nationally of 46%, as reported by AARP. Our staff turnover rate is more than 6X lower than the national nursing home average. Many of the nurses at the Witherell have worked here between 10 and 30 years, creating stability and continuity that’s an essential part of quality care.
