Who is Donald Rumsfeld from the nonfiction book, The Afghanistan Papers?

Donald Rumsfeld was a businessman and political operative who twice served as Secretary of Defense. His first stint in this role was in the administration of President Gerald Ford (née Leslie Lynch) where he worked closely with Ford’s CIA Director, George H.W. Bush from 1975 to 1977. His second junket as Secretary of Defense was in the administration of George H.W. Bush’s son, George W. Bush, from 2001 to 2006.