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.
Amaryl managed to discover and study mathematics with the help of a friendly librarian. He met Seldon when the latter visited the heatsink complex out of curiosity whilst fleeing from Eto Demerzel and living in Dahl. Seldon immediately recognized and fostered Amaryl's innate mathematical abilities and was able to get him into University. He eventually gained a doctorate and became Seldon's closest and most trusted co-worker. Unfortunately, Amaryl's devotion to his work would be his undoing, giving him an early death from overwork.