Our office provides primary care medical cervices for patients age 16 and older. Welcome to our office for medical care during and after the COVID-19 Pandemic. ... Marc H. Greenstein, MD, FACP Beth Zambryck, Nurse Practitioner Beth Zambryck, Nurse Practitioner. Marc H. Greenstein, MD, FACP.Evergreen Medical Center Marc Greenstein, MD Beth Zambryck, APRN‧Shop.