Mary Parker Follett (3 September 1868 – 18 December 1933) was an American social worker, management consultant and pioneer in the fields of organisational theory and organisational behavior. She also authored a number of books and numerous essays, articles and speeches on democracy, human relations, political philosophy, psychology, organisational behaviour and conflict resolution. Along with Lillian Gilbreth, Mary Parker Follett was one of two great women management gurus in the early days of classical management theory. She admonished overmanaging employees, a process now known as micromanaging, as "bossism" and she is regarded by some writers as the "mother" of Scientific Management. As such she was one of the first women ever invited to address the London School of Economics, where she spoke on cutting-edge management issues. She also distinguished herself in the field of management by being sought out by President Theodore Roosevelt as his personal consultant on managing not-for-profit, non-governmental, and voluntary organizations. In her capacity as a management theorist, Mary Parker Follett pioneered the understanding of lateral processes within hierarchical organisations (which recognition led directly to the formation of matrix-style organizations, the first of which was DuPont, in the 1920s), the importance of informal processes within organizations, and the idea of the "authority of expertise"--which really served to modify the typology of authority developed by her German contemporary, Max Weber, who broke authority down into three separate categories: rational-legal, traditional and charismatic.