Holger's research is focused on developing improved techniques for the sustainable management of infrastructure (with a particular focus on water, energy and the water-energy nexus) and natural resources (with a particular focus on water resources and natural hazards) in an uncertain environment. This includes elements of modelling (with a particular focus on machine learning and hybrid process / data driven models), optimisation (with a particular focus on evolutionary algorithms and other metaheuristics) and decision support (with a particular focus on strategic planning under deep uncertainty). He is currently the Research Leader of the Economics and Strategic Decisions research cluster of the Bushfire and Natural Hazards Cooperative Research Centre, as well as the Leader of a project focussed on the development of a decision support system for the assessment of policy and planning investment options for optimal natural hazard mitigation Holger also leads an internal University of Adelaide project on Collaborative Analysis for Secure, Alternative, Affordable Energy.