Great question, no idea who are the exact people behind this (just found this online), but according to http://www.darpa.mil/tag-list?tt=73&PP=2 some interesting folks joined them recently (after 2013):

Mr. Wade Shen (Program Manager – interests: machine learning) http://www.darpa.mil/staff/mr-wade-shen

Dr. William Regli (Defense Sciences Office (DSO), Deputy Director – interests: artificial intelligence, robotics) http://www.darpa.mil/staff/dr-william-regli

Dr. Reza Ghanadan (Defense Sciences Office (DSO), Program Manager – interests: data analytics, autonomy, machine learning and artificial intelligence in information and cyber-physical systems) http://www.darpa.mil/staff/dr-reza-ghanadan

Dr. Paul Cohen (Information Innovation Office (I2O), Program Manager - interests: artificial intelligence, machine learning) http://www.darpa.mil/staff/dr-paul-cohen

Most of them can be found on linkedin.