Deborah Armstrong is in her third year as chief executive officer of Rockdale Medical Center, the county’s only hospital. The for-profit, acute-care hospital has more than 1,200 employees and treats over 85,000 patients a year. Armstrong started her career as a physical therapist 30 years ago, then worked her way up through various management positions at Georgia Baptist Hospital (now Atlanta Medical Center) and RMC. She offered these leadership lessons in a recent News interview.