Who is Lord Alexander Chung-Sik Finkle-McGraw from The Diamond Age, or, Young Lady's Illustrated Primer and what is their importance?

Lord Finkle-McGraw is an "Equity Lord"—which means that he is a major investor in the company that produces consumable goods. He commissions the initial Illustrated Primer, which he wanted to give as a present to his granddaughter Elizabeth. He follows Nell's progress and protects her and Carl Hollywood throughout their ordeal. Upon finding that Hackworth has breached their contract, he uses the engineer as a double-agent to spy on the revolutionary activities of Dr. X.