After she had a successful run in Turner’s HR department that included rising to the role of global chief human resources officer, AT&T tapped Santone for the important role of chief administrative officer. Not only does she have to deal with the employee buyouts and other issues that come with a major acquisition, but she’s responsible for managing enterprise-level succession planning—a task that’s been in the spotlight with CEO/chairman Randall Stephenson making plans for his eventual retirement.