"The Sheikh and the Doctor: Osama Bin Laden and Ayman al-Zawahri". The book by journalist Abdul-Rahmanal-Halloush delves into the lives of the "sheikh" Osama bin Laden and the "doctor" Ayman al-Zawahiri, with extensive research into terrorist causes and organizations. It covers terrorist organizations and relations to the Salafist ideology, beginning with the the assassination of Egyptian President Anwar al-Sadat, through war and up to 11 September. The book also provides extensive research on the interrelationships between the leaders of the organizations and strategists and implementers.