Art Dankwalther was financial mathematician working Fuchi with delusion of grandeur and then fired during a layout (when you think about, there's was a kind of foresight in making him a bad guy...). In his Will, Dunkelzahn bequested him an insane amount of money, 34 billions of UCAS dollars, officially to repay for a gold coin an ancestor lend him.
At that point, Dankwalther was a junkie on the brink of madness, lost in the barrens of some city (Boston I think). He didn't hear about the president, his death or his will, and the Draco Foundation was unable to find him. When he heard about Richard Villiers creating a new company in 2059, Novatech, Dankwalther somewhat came to believe he could get his job back. He got access to a computer and send an e-mail.
That was enough for the Draco Foundation to find him, verify his identity, clean him from his drugs habit and hands him the money. Dankwlather started a life of partying, until he meet Richard Villiers. Dankwlather shoke hands with his former boss, who had no idea that guy ever worked for him. Dankwalther got mad. Fired all his new employees, sold the house, boats and cars, and started working on his revenge.
What you had was a financial mathematician with billions of dollars of leverage and no search for final profits. Yet, he used a part of the money to make more money. Another part went to fund black ops. And the bulk of it would be engaged in massice stock market manipulations. He made a first test by crushing A multinational Tokugawa Technologies. A cakewalk. Then another test targeted AA megacorporation Gunderson of Miami. Dankwalther teams were able to down a megacorporation. But the ultimate target always had been Novatech.
Dankwalther actions hurt Novatech a lot. He is the main reason Novatech needed fresh funds and was forced to engage in an IPO (which Dankwalther failed to predict actually). Villiers also became aware of Dankwalther existence (thanks to Shadowland) and tried to fought back, including a ¥5 millions bounty on his head. The story came to end during during the 2064 or shortly after, when the Corporate court ordered a Thor shot on Dankwalther know position.
Threats 2 and System Failure are the main sources, with some traces of Dankwalther apparition showing up in SOTA:2064 news articles.