In the first few months of the 9/11 Commission’s investigation, the ten commissioners rarely visit the staff’s offices, partly because they are not allowed to have their own offices there. This means that the commissioners are separated from the staff, and that Executive Director Philip Zelikow acquires more control of the inquiry. Author Philip Shenon will write: “[T]he staff could see that with every passing day, Zelikow was centralizing control of the day-to-day investigation in his own hands. He was becoming the eleventh commissioner and, in many ways, more powerful than the others.… Zelikow was in charge.” [Shenon, 2008, pp. 69-70, 85-86]