Ian Williamson is both a professional land surveyor and chartered engineer who is professor of surveying and land information at the Center for Spatial Data Infrastructure and Land Administration, Department of Geomatics, at the University of Melbourne, Australia. His expertise is the cadastre, land administration, and spatial data infrastructures. Stig Enemark is a professional land surveyor who is professor of land management and problem-based learning at the Department of Development and Planning at Aalborg University, Denmark. He is president of the International Federation of Surveyors. Jude Wallace is a land policy lawyer who is a senior fellow at the Center for Spatial Data Infrastructures and Land Administration at the University of Melbourne. Her specialties range from improving the most modern land administration to developing pro-poor land strategies. Abbas Rajabifard is a professional land surveyor and chartered engineer, who is an associate professor and director of the Center for Spatial Data Infrastructures and Land Administration at the University of Melbourne. He is president of the Global Spatial Data Infrastructure Association.