Blair Trewin has been a climate scientist with the Bureau of Meteorology since 1998. His specialist areas are the development of long-term historical data sets for the assessment of climate change, and the analysis of extreme events, both current and historic. He was the lead developer of the Bureau's current long-term Australian temperature data set, ACORN-SAT. In the international sphere, he was the scientific coordinator of the World Meteorological Organisation's annual Global Climate Statement in 2010 and 2011, and is a member of the WMO's Expert Team on Climate Change Detection and Indices, and Task Team on Definitions of Extreme Weather and Climate Events. He is also the current President of the Australian Meteorological and Oceaonographic Society, and editor of the Australian Meteorological and Oceanographic Journal.