It looks like we will have Lt Col. Dave Grossman as one of the speakers at the DC event.

He is a leading expert in the science of violence and killing. He has several books and does lectures around the world. Check out his website for more info.

excerpt from his bio:

LT. COL. DAVE GROSSMAN, U.S. Army (Ret.) Director, Warrior Science Group,

Lt. Col. Dave Grossman is an internationally recognized scholar, author, soldier, and speaker who is one of the world's foremost experts in the field of human aggression and the roots of violence and violent crime.