David Calderwood; Libby Lowenthal; Alice Tzeng; Tracy Thornton; Margaret Barringer
Dr. David Calderwood: Medical Director David Calderwood, MD graduated from the University of Washington in Seattle in 1981. | Dr. Libby Lowenthal: Oncologist & Lifestyle Medicine Dr. | Alice Tzeng: Medical Doctor Alice Tzeng, MD spent most of her life in NJ, and graduated college from the New Jersey Institute of Technology. | Tracy Thornton: ACNS-BC, FNP-C Family Nurse Practitioner As a dedicated and compassionate Nurse Practitioner (NP) at Sparrow, I am committed to providing high-quality healthcare services to individuals and families in our community. | Margaret Barringer: AGACNP-BC Nurse P