Volcker is a former Federal Reserve chair under Carter and Reagan who is now working in the Obama administration as chair of the President's Economic Recovery Advisory Board. So, he would have a special interest in the Treasury Department.
"The Secretary of the Treasury is sitting there without a deputy, without any undersecretaries, without any, as far as I know, assistant secretaries responsible in substantive areas at a time of very severe crisis. He shouldn't be sitting there alone."
But there's little doubt that the Treasury Department is not the only department that was significantly weakened during the Bush years.