The iron cage, the routinization of charisma, and the rationality of means and ends are just a few of the concepts introduced in his sociological essays.  
He worked as a law professor in Berlin in 1892, before receiving an appointment as a professor of political economy at the University of Freiburg in 1894.  The iron cage, the routinization of charisma, and the rationality of means and ends are just a few of the concepts introduced in his sociological essays.  FTP, identify this German sociologist who wrote The Protestant Ethic and The Spirit of Capitalism.
He worked as a law professor in Berlin in 1892, before receiving an appointment as a professor of political economy at the University of Freiburg in 1894.  
Max Weber