Star of that show is apparently a Baen author - Travis S. "Doc" Taylor, PhD. Wrote a few books with John Ringo, a few on his own, and a few with a couple of other guys. He tinkers with some neat gear and concepts, like developing honest-to-God warp-drive based on Alcubierre's theory. We aren't there yet, but...
His writing's... fair, not great, FTR. Haven't watched the show, as I first saw it was on against Mythbusters, so I'm not switching off from Jamie and Adam for a new show. Might try to catch it on re-runs.