Building capacities of sustainability change agents is primordial to increase the effectiveness and to accelerate the process towards a sustainable society. This research investigates the current challenges and practices of sustainability change agents and analyses current research in the field of leadership development. A Framework for Strategic Sustainable Development is described as a means to overcome and address the complex challenges that society faces today. Furthermore the development of leadership capacities of sustainability change agents is suggested as a strategic factor for the process of sustainable development. A literature study highlights the new dimension to leadership development and defines its characteristics. Interviews and focus groups with sustainability practitioners and students are analysed. From this analysis a set of methods and approaches to professional and personal development is derived. The research points to the need of developing leadership capacities, of sustaining them and of having the ability to be self-aware. It is mentioned that the development of these capacities will depend on the supporting environment, the methods employed and on the candidate itself in order to achieve best results.