Why Marines and K9s Make the Best Team: Video from GVE Speaker Matthew Callahan Visual storyteller and former Marine Callahan gets it.GV Staff ⋅ Nov 18, 2018 Government Video Expo speaker and military videographer Sgt. Matthew Callahan examines the bond between Marines and their K9 partners in this award-winning video. Callahan will be speaking at Government Video Expo Wednesday, November 28 at 3:00 p.m. about his work as a visual storyteller. A Marine who was the first servicemember to be named both Military Photographer and Videographer of the Year by the Department of Defense, Callahan will screen and discuss his striking and powerful multimedia projects within the military… and beyond. Government Video Expo is held November 28 and 29 at Walter E. Washington Convention Center in Washington, D.C. The event features 32 live free presentations and a free exhibit floor, as well as additional training opportunities. Register here to attend. To plan your visit, you can download the show guide in advance here.