ichard Clarke, best-selling author and senior White House advisor for more than a decade, will be the keynote speaker at the MBA Gala Dinner on Thursday, Nov. 1 at the InterContinental on Boston’s Waterfront. Clarke, the nation’s former counterterrorism chief, served under seven presidents and spent three decades fighting terrorism. In 2004, after leaving the White House, Clarke wrote The New York Times bestseller “Against All Enemies: Inside America’s War on Terror.”