Although Wolfowitz was ultimately responsible for the Defense Planning Guidance, as it was released through his office and was reflective of his overall outlook, he did not participate in its drafting, nor saw it before it was publicly released. The task of preparing the document fell to Libby, who delegated the process of writing the new strategy to Zalmay Khalilzad, a member of Libby's staff and longtime aide to Wolfowitz. In the initial phase of drafting the document, Khalilzad solicited the opinions of a wide cross-section of Pentagon insiders and outsiders, including Andrew Marshall, Richard Perle, and Wolfowitz's University of Chicago mentor, the nuclear strategist Albert Wohlstetter. Completing the draft in March 1992, Khalilzad requested permission from Libby to circulate it to other officials within the Pentagon. Libby assented and within three days Khalilzad's draft was released to the New York Times by "an official who believed this post-cold war strategy debate should be carried out in the public domain."