What other expeditions did Ernest Shackleton go on?

Ernest Shackleton participated in several notable expeditions, including the Discovery Expedition (1901-1904) led by Robert Falcon Scott, where he served as third officer. He also took part in the Nimrod Expedition (1907-1909), during which he famously reached the farthest southern point at that time. Later, he led the Endurance Expedition (1914-1916), aiming to cross Antarctica, which became famous for its harrowing survival story after the ship was trapped and destroyed by pack ice. Additionally, Shackleton organized the Shackleton-Rowett Expedition (1921-1922), though it was ultimately cut short due to his death.