Memorial Hermann Health System is the largest not-for-profit health system in southeast Texas and consists of 16 hospitals, 8 Cancer Centers, 3 Heart & Vascular Institutes, and 27 sports medicine and rehabilitation centers, in addition to other outpatient and rehabilitation centers. It was formed in the late 1990s when the Memorial and Hermann systems joined. Both the Memorial and Hermann health care systems started in the early 1900s. The administration is housed in the new Memorial Hermann Tower, along with the existing System Services Tower, of the Memorial Hermann Memorial City Medical Center.