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Richard A. Clarke , former head of counterterrorism at the National Security Council , is the author of " Against All Enemies : Inside America 's War on Terror . " Tanner is the author of " The 6.2 Percent Solution : A Plan for Reforming Social Security . He was the author of " Physicomathesis de lumine , coloribus , et iride , aliisque annexis " ( Bologna , 1665 ) , published after his death . He is the author of " Lettres d'un Abb ses religieux " and " Lettre de Consolation " . Margo Jefferson , critic-at-large for the " New York Times , " and winner of the Pulitzer Prize for criticism , is the author of " On Michael Jackson " ( 2006 ) , a witty , erudite , incisive , passionate , and highly original meditation on the embattled pop star 's significance .