His bestseller "Hughes: The Private Diaries, Memos and Letters", a memoir on billionaire Howard Hughes, was released on September 11, 2001. Hack was being interviewed live on the "Today" show by Matt Lauer when the first plane crashed into the World Trade Center, and Lauer consequently had to cut their interview short to report on the ongoing events. The abrupt ending of their interview and the early reports of the attack from the "Today" show, is shown in a continuous loop, as part of an exhibit in the National September 11 Memorial &amp; Museum in New York City.