Sir Ernest Shackleton Expedition Leader
An Irish-born polar expedition veteran, Shackleton approached to within 745
miles of the South Pole with Robert Scott on the 1901 Discovery expedition,
then pressed to within 97 miles on his own Nimrod expedition of 1908.
Imperious, single-minded, ferociously loyal to his men,
he once said "Optimism is true moral courage," a tenet he lived by until his
death on South Georgia Island in 1922.