Private company

Mather Hospital

Logo: matherhospital.org4

Hospital in New York, United States

Mather Hospital (formerly known as John T. Mather Memorial Hospital) is a general teaching hospital operated by Northwell Health, located in Port Jefferson, New York. It is named after John T. Mather (1854–1928), who, in 1916, made provisions to his will to create the hospital.2 Wikipedia text CC BY-SA 4.0

Last updated Oct 20, 2026.

Overview

1929Founded1

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Mather Hospital in Port Jefferson, NY
Photo: Stuartdv, CC BY-SA 4.0, via Wikimedia Commons5

Mather Hospital (formerly known as John T. Mather Memorial Hospital) is a general teaching hospital operated by Northwell Health, located in Port Jefferson, New York. It is named after John T. Mather (1854–1928), who, in 1916, made provisions to his will to create the hospital.2

Corporate structure

Mather Hospital is part of a group headed by NORTHWELL HEALTH, INC.. 20 entities, 2 countries on record. Switch between the flow chart and the network, and select any entity to see its details.

  • NORTHWELL HEALTH, INC. New Hyde Park, New York, United States
    • Northwell Health Westbury, New York, United States
      • Mather Hospital Port Jefferson, New York, United States
      • The Feinstein Institute for Medical Research Subsidiary
      • Arthur Smith Institute for Urology Subsidiary · Lake Success, United States
      • Boca Raton Regional Hospital Subsidiary · Boca Raton, United States
      • Glen Cove Hospital Subsidiary · Glen Cove, United States
      • Huntington Hospital Subsidiary · Pasadena, United States
      • Lenox Hill Hospital Subsidiary · Manhattan, United States
      • Long Island Jewish Medical Center Subsidiary · Manhattan, United States
      • Maimonides Medical Center Subsidiary · Brooklyn, United States
      • Nassau University Medical Center Subsidiary · New York, United States
      • North Shore University Hospital Subsidiary · New York, United States
      • Northwell Health Cancer Institute Subsidiary · Lake Success, United States
      • Northwell Health Orthopaedic Institute Subsidiary · Bay Shore, United States
      • Plainview Hospital Subsidiary · New York, United States
      • Staten Island University Hospital Subsidiary · Staten Island, United States
      • Syosset Hospital Subsidiary · Oyster Bay, United States
      • Zucker Hillside Hospital Subsidiary · New York, United States
    • REGIONAL INSURANCE COMPANY LTD. Subsidiary · Hamilton, Bermuda

Built from parent and subsidiary links from GLEIF, the Global Legal Entity Identifier Foundation (CC0); subsidiaries, stakes and holdings from Wikidata (CC0). Each entity in the chart links to its source.

Subsidiaries and ownership

Parent company (GLEIF)

Ultimate parent

Ownership links from GLEIF, the Global Legal Entity Identifier Foundation (CC0); each one cites its LEI record.

Timeline

  1. Apr 11, 2023Parent Directly consolidated by Northwell Health3
  2. 1929Founded Founded1

Sources

The numbers on this page point here. Each one links to the record it came from.

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  4. 4
    Company websiteMather Hospital logo
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