http://jamestown.org/terrorism/news/article.php?articleid=2369766
"Mustafa Setmariam Nasar, better known as Abu Musab al-Suri (the Syrian), is widely believed to be the most prolific al-Qaeda ideologue and trainer alive. Currently working closely with the Zarqawi network, and probably based in Iraq, Nasar also allegedly exercises operational control over several al-Qaeda linked networks in the West."
