Final answer:
Frederick Winslow Taylor and Henry Gantt contributed to Scientific Management. Taylor's book The Principles of Scientific Management introduced management theories, personnel selection and training, as well as time and motion studies. Gantt developed the Gantt chart for managing project tasks.
Step-by-step explanation:
Frederick Winslow Taylor and Henry Gantt were the theorists who contributed to Scientific Management. Taylor, an engineer, published the book The Principles of Scientific Management in 1911, which examined management theories, personnel selection and training, as well as work itself, using time and motion studies. Gantt, a mechanical engineer and management consultant, developed the Gantt chart, which is a visual tool for scheduling and managing project tasks.