 Williams left the partnership of D.C. firm Hogan & Hartson to launch his own litigation firm.Recent high-profile cases include the successful defense of U.S. President Clinton's impeachment, representation of Enron's law firm Vinson & Elkins, representation of the motion picture studios in the Kazaa/Grokster file-trading litigation, defense of the Vioxx cases, and counsel for the plaintiff states in the "United States v. Microsoft" antitrust remedy trial.The firm represented Colonel Oliver North during the Iran-Contra Affair and John Hinckley, the would-be assassin of Ronald Reagan.