The Senior Director, National Security will serve as the Profit and Loss (P&L) leader for a key national security portfolio, driving financial performance, operational excellence, and customer satisfaction across existing and evolving programs. This role owns full P&L responsibility (revenue, bookings, profit margins, cash flow) for assigned accounts/programs, while leading program delivery teams, ensuring compliance, and positioning the portfolio for sustainable growth through recompetes, on-contract expansion, and strategic enhancements. The focus is on maturing operations, maximizing profitability, and delivering mission value rather than frontline new business capture.