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Esker is one of the first Hearthian astronauts, and is located at his outpost on The Attlerock. They used to run the Lunar Outpost before the Space Program forgot about it, and in turn Esker himself. Now he just "keeps an eye on things" from the outpost.
Esker occasionally shoots Little Scouts at the village on Timber Hearth, as a method of "one-way communication" with ground control.
Esker is incredibly lonely on The Attlerock as he no longer gets visitors, since the space program grew more successful and less crashes are made. He repeatedly asks the player character to stay with him by the fire. He is also the first spacefaring Hearthian to appear in the epilogue.