This paper proposes a model of leadership within tertiary education based on research into expertise and institutional distinctiveness. It builds on two contrasting styles of institutional development. Firstly, in the traditional university (higher education) sector, promotion to senior management positions has tended to be based on academic prowess, largely relating to research capability. The result is senior academic leaders who may not be well suited to line or operational management. By contrast, in the traditional polytechnic (vocational education and training) sector, promotion to leadership positions has tended to be based more on perceived managerial qualities, and the resultant leaders may be more inclined to be good managers without displaying overt academic leadership. A model of shared academic management and leadership focused on departmental/school level, based on research into the nature of professional expertise, is therefore proposed which brings together the strengths of both of the above styles. This model develops the responsibilities of both the academic leader and the operational manager and explores their symbiotic relationship. The performance of associated administrative functions is also considered in regards to the overlap between the administration occurring in these roles and that of designated office administrators. The implications of this model on organisation structure and culture and on staff promotion and career development are also addressed. The application of this model to contemporary tertiary institutions that focus on vocational and professional education as a point of distinctiveness in a competitive tertiary education market is also explored. In particular, the potential advantages of this model for dual sector institutions which bring together the strengths of the higher education and the vocational education and training sectors are discussed.