Historian David Day has taught at universities in Australia, Ireland and Japan. He has been the Keith Cameron Professor of Australian History at University College Dublin and twice been visiting Professor of Australian Studies at the University of Tokyo. Day has also held an ARC Senior Research Fellowship at La Trobe University in Melbourne.
Day's historical writing includes biographies and the official histories of the Australian Customs Service and the Bureau of Meteorology. In 2012, he published Antarctica: A Biography.