Instead both he and his mentor , Edgeworth David , stayed an extra year .
Mawson joined Ernest Shackleton 's Nimrod Expedition ( 1907 -- 09 ) to the Antarctic , originally intending to stay for the duration of the ship 's presence in the first summer .
Instead both Mawson and Mawson 's mentor , Edgeworth David , stayed an extra year .
Mawson joined Ernest Shackleton 's Nimrod Expedition ( 1907 -- 09 ) to the Antarctic , originally intending to stay for the duration of the ship 's presence in the first summer .