Who is Dr. X. from The Diamond Age, or, Young Lady's Illustrated Primer and what is their importance?

Dr. X is a Chinese technology hacker. He runs the Flea Circus as a cover-up for his illicit enterprises. He replicates the Illustrated Primer for Hackworth and orders his mugging. He is at the head of a huge organization that rescues a quarter of a million Han girls from their harsh living conditions. He plans to educate the refugees with copies of the Primer. His real name is too complicated to be pronounced by Westerners, so he goes by the name of Dr. X.