Henri Fayol was a French mining engineer and director who developed one of the earliest comprehensive theories of management. He outlined 14 principles of management that are still used today, including division of labor, authority and responsibility, discipline, and unity of command. Fayol also identified five primary functions of management: planning, organizing, commanding, coordinating, and controlling. His work in the late 19th/early 20th century helped establish the field of management studies.