He was stationed at test number two, Subliminal Suggestions Tech, using holodisks to send people subliminal messages to cause them to act strangely, by taking off their clothes or running around and screaming. The terminal entries on J. Hodgson's terminal show signs that Langston also used this technique on their colleagues.
He sat in the same room as C. Grunner. As with the other employees, Grunner and Langston were also unwillingly used as test subjects. When the bombs fell, Langston stormed into their office to warn Grunner, after which he was shot by him.