HealthAlliance of the Hudson Valley®, a member of Westchester Medical Center Health Network, is the alignment of HealthAllian ... ce Hospital: Mary’s Avenue Campus, HealthAlliance Hospital: Broadway Campus, as well as Margaretville Hospital and Mountainside Residential Care Center. We are an integrated health care system committed to providing quality and compassionate medical care for our patients, their families and our community. We are dedicated to offering a full range of services and medical options, while strengthening the quality of your health care. Our comprehensive services, programs and technologies are accessible right where you need them — close to home. You can always be assured that our highly trained and caring staff puts the needs of our patients first. For further information about HealthAlliance, visit our web site at hahv.org. read more