How many expeditons did Douglas mawson go on?

Douglas Mawson participated in three major expeditions to Antarctica. His first was the British Antarctic Expedition from 1907 to 1909, followed by the Australasian Antarctic Expedition from 1911 to 1914, which he led. He also took part in the British Australian New Zealand Antarctic Research Expedition in 1929-1931. Mawson's contributions significantly advanced the understanding of the Antarctic region.