NEW YORK (AP) — Former New York Mayor Rudy Giuliani is joining international law firm Greenberg Traurig as chair of its cybersecurity and crisis-management practice. Giuliani is leaving Houston law firm Bracewell & Giuliani, which will rename itself Bracewell. In 2005, Giuliani helped open a New York office for the firm. Greenberg Traurig said Tuesday that Giuliani will work with its government-regulatory, cybersecurity and data-privacy lawyers.