For more than twenty years, Mark has lead research, development, and application of environmental markets and ecosystem accounting. This work has engaged a wide variety of industries, academic institutions, and government agencies at regional, state, and national levels. It has equipped Mark with a deep understanding of the complex issues surrounding the sustainable management of natural capital. Mark applied his market-based experience to inform Australia’s approach to environmental-economic accounting. He produced Australia’s first set of experimental ecosystem accounts and continues to develop new systems and processes to publish Australian environmental accounts in line with SEEA. As principal of IDEEA, Mark continues to advise governments, statutory authorities, NGOs, and private sector organizations around the world in the application of NCA.