His webpage here. (where his book can be found)
Filkins has spent a long time in Afghanistan, Iraq and other places in the Middle and Far East as a reporter for the NY Times. He’s a good writer, knows his subjects and spends a lot of time on the ground. He doesn’t hold much back.
A good interview with Filkins on NPR can be found here (without excessive focus on women’s rights and other topics that are as much a part of the lens with which we look at Afghanistan as I imagine Afghanistan is in itself…).