The Supervisor serves as the subject matter expert for Family and Medical Leave Act (FMLA), caregiver leave, military leave, short-term disability (STD), long-term disability (LTD), workers'' compensation, state leave programs, and company-sponsored absence programs. Headquartered in Akron, Ohio, FirstEnergy includes one of the nation''s largest investor-owned electric systems, more than 24,500 miles of transmission lines that connect the Midwest and Mid-Atlantic regions, and a regulated generating fleet with a total capacity of 3,780 megawatts.