Yugo Amaryl, along with Hari Seldon, worked on psychohistory until his death at age 52. Asimov fleshes-out the character's origins in "Prelude to Foundation" (1988). Amaryl was born on Trantor in the Dahl sector. He worked as a "heatsinker", one of many people tending the vast subterranean operations that generate energy from heat in the deep recesses of the planet. The work was hard, hot and did not require great intelligence. These menial workers tended to be ostracized by those not forced to work underground.