Public entrepreneurship is the process of introducing innovation, the generation and implementation of new ideas, in the public sector. Building on this definition and drawing from a logical tree, four types of public sector entrepreneurs are identified: policy entrepreneurs, bureaucratic entrepreneurs, executive entrepreneurs; and political entrepreneurs. Policy Entrepreneurs, outside the formal positions of government, introduce and facilitate the implementation of new ideas into the public sector. Bureaucratic Entrepreneurs occupy non-leadership positions in government and introduce and implement new ideas from their particular vantage point in public organizations. Executive Entrepreneurs from their leadership positions in governmental agencies and departments, generate and implement new ideas; and finally, Political Entrepreneur introduce and implement new ideas as holders of elective office. (KR)