Climate Councillor, Climate Council of Australia & Climate Change Expert, Australian National University | AUSTRALIA Climate Crisis Calling for a Global Response Professor Will Steffen is a climate change expert and researcher at the Australian National University, Canberra. He was on the panel of experts supporting the Multi-Party Climate Change Committee, has served as the Science Adviser to the Australian Department of Climate Change and Energy Efficiency, and was chair of the Antarctic Science Advisory Committee. From 1998 to 2004, Professor Steffen served as Executive Director of the International Geosphere- Biosphere Programme, an international network of scientists studying global environmental change. His research interests span a broad range within the fields of climate change and Earth System science, with an emphasis on sustainability, climate change, incorporation of human processes in Earth System modelling and analysis, and on sustainability and climate change. In addition, Steffen has been active on the climate change science-policy interface for three decades and has played a leading role in the development of Earth System science internationally. He is the author of numerous publications on climate science, including contributing as an author and reviewer to five IPCC (Intergovernmental Panel on Climate Change) assessments and special reports between 2000 and 2018.