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He spent years as a political prisoner when he was young. As a result, he dedicated his terms as secretary-general to fighting corruption in the government.
Chrisjen Avasarala privately refers to him as "The Bobblehead." The nickname reinforces the fact that Esteban acts strictly as a man influenced by his underlings as opposed to one that has any meaningful thought or action of his own.
Both the Eros incident and the Ganymede incident occurred during Sorrento-Gillis's term and, prior to the election to his office, he was massively criticized for turning a blind eye to rogue corporate entities such as Protogen and Mao-Kwikowski Mercantile. He lost his reelection to Nancy Gao.