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