ACT USA founder Stuart Sheldon has been “the man behind the curtain” as tech director for the Southern California Linux Expo from early in the expo’s history. For SCALE 11X, Stuart will leave the top-secret SCALE Operations Bunker deep in the bowels of the Hilton Los Angeles Airport hotel — OK, it’s a room on the same floor as the rest of the expo’s presentations — to give the talk “Linux as an IPv6 Dual Stack Firewall” on Saturday, Feb. 23 at 3 p.m. in the Los Angeles B room. The SCALE Team caught up with Stuart during his vast preparations for SCALE 11X and got him to talk about his presentation and some of the history of the expo.