What Is a Manager? A manager is a person in an organization who is responsible for carrying out the four functions of management, including planning, organizing, leading and controlling. You will notice that one of the functions is leadership, so you might ask yourself if it would be safe to assume that all managers are leaders. Theoretically, yes - all managers would be leaders if (and this is a big 'if') they effectively carry out their leadership responsibilities to communicate, motivate, ins