My research program focuses on understanding the behaviour of large complex problems and systemic risks that arise from the interactions between social, ecological, and technological systems. This focus includes how to use this understanding to create computational tools that enable decision makers design and evaluate options to deal with such complexity. To achieve this, I use systems thinking/dynamics based methodologies to analyse complex problems as dynamic and multi-dimensional systems where human cognition is central element to help understand and manage the situation. I have applied these methodologies to address a wide range of problems in both environmental and defence sectors, such as: predicting the impacts of climate change and coal mining on socio-ecological systems, assessment of water allocation plans in the Murray Darling Basin, and lifecycle assessment of large-scale military capabilities. In addition, I have an interest in how to transfer and integrate knowledge from multiple projects and application domains to improve the practice and teaching of system dynamics methodologies.