Hartford HealthCare supports Nurse Practitioners and Physician Assistants in practice: Dedicated support and voice for our Nurse Practitioners and Physician Assistants through the Office of Advanced Practice directed by Sarah Clark, MBA, MHS, PA-C, BSN, RN, System Director of Advanced Practice. Physician Assistants Role Scope: Under established guidelines and in collaboration with Emergency Medicine physicians, Nurse Practitioners and Physician Assistants evaluate, diagnose, and manage patients presenting with a wide range of acute illnesses, injuries, and trauma conditions.