test juliette kayyem, i'll start with you, fill in the portrait of al-zawahiri what is important to know about his biography and experience. >> i think the biography begins with who he was when he was born. he comes from an elite family with long ties to egyptian leadership, not unlike bin laden was. bin laden's family was with the saudis. so he is of a certain ilk and elite that does not represent sort of the young al qaeda movement right now. nonetheless, he spent his entire life committed to the egyptian islamic jihad and ultimately getting together with bin laden. our interest in him begins with the africa embassy bombings going on to the u.s.s. cole. he's been as we know and as you reported, he's been in hiding. and i think the most important thing right now is just simply the timing of this announcement. it is six weeks later. and there is a debate about whether that represented a movement to get rid of him, and not have an egyptian lead al qaeda. and or is it the nature that here is a group that has clearly been compromised. they don't know what we know. and it just took them a lo