Richard Engel, NBC News' Chief Foreign Correspondent, has been reporting from Libya on the fall of the Gadhafi regime over the last several months and has spent most of the last year covering the Arab Spring sweeping the Middle East.

Prior to that, he spent most of the last decade covering the U.S. War on Terror in Iraq and Afghanistan that came out the September 11th attacks.

Ahead of the 10 year anniversary of the 9/11 attacks, he and MSNBC's Rachel Maddow have collaborated on a documentary about the aftermath of the terrorist attack and how it has changed life in the U.S., as well as our foreign policy.

The first hour of the documentary, "Day of Destruction, Decade of War," will premiere Thursday on MSNBC at 9 p.m.ET. The second two hours will air on Friday, Sept. 2 from 9-11p.m. ET. The full three hour documentary will air on Friday, Sept. 9.

During a lively Live Chat earlier today Richard answered reader questions about the significance of the 10-year anniversary of the 9/11 attacks, Iraq, Afghanistan, Libya and the Arab Spring.

Click below to replay the chat. Please tune into MSNBC to see his documentary tonight and tomorrow.