Principles, principals, and ambition: the politics of bureaucratic entrepreneurship -- Glorious heroes, tragic heroes, antiheroes: how bureaucratic entrepreneurship happens (or doesn't) -- A theory of bureaucratic ambition: why bureaucratic entrepreneurship happens (or doesn't) -- The market for bureaucratic entrepreneurs: career path and professional innovation -- The psychology of bureaucratic entrepreneurship: human motivation and political advocacy -- Ramps and ladders: how career systems foster or inhibit bureaucratic entrepreneurship -- What bureaucratic ambition means for democracy