Gary Kornman’s been accused of making millions helping high-level execs set up tax shelters, but now his former legal counsel at D.C.-based boutique Robbins, Russell, Englert, Orseck & Untereiner is taking him to court for unpaid legal fees.

The firm represented Kornman after the Securities and Exchange Commission filed suit in 2004 against him for allegedly using confidential information from senior executives at publicly traded companies to trade securities.