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/Nurse Practitioners Role Scope: Under established guidelines and in collaboration and/or supervision with the practice physician(s), Physician Assistants/Nurse Practitioners perform routine physical examinations, and formulate medical, educational, and psychosocial plans to treat patients.