As the head scribe, Taggart is supposed to be in charge of all scribe activities in the bunker, including overseeing research, cataloging data, and processing recovered technology. He consistently neglects his duties according to Senior Scribe Linda Schuler however, forcing her to pick up the slack instead. Despite her insistence and repeated complaints to the elder, Taggart remains at his post, fiddling with and coding new virtual reality simulations, aided by his protege, Melissa Watkins, ensuring that every one of the Brotherhood members has spent a minimum of five hours a week in training simulations. He was also supposed to be responsible for the "abort self-destruct sequence" of the Hidden Valley bunker systems, but never got around to implementing it.
Conversations with other Brotherhood of Steel faction members in the Hidden Valley bunker suggest that Taggart is a lecher who promoted Watkins out of her classes not so much for her intelligence as her appearance.
When Veronica Santangelo is the player character's party she'll greet him with, "Scribe Taggart! It's your favorite student!"
Various members of the Brotherhood say that the elder has him working on a secret project.
↑The Courier: "Did you make the training VR yourself?" Lars Taggart: "Not far from it. When we reclaimed this bunker, I found a number of VR tapes. Most were corrupted, but a few programs still ran. Using those as my foundation, I was able to code the training VR, as well as other applications." (Lars Taggart's dialogue)
↑The Courier: "Do all of the brothers use this equipment?" Lars Taggart: "Everyone in the base has to spend a minimum of five hours a week running tactical simulations, but outside that, interest is scarce. It wasn't always this way. When we first moved into the bunker, everyone was so excited that the VR systems were intact. Over time, though, my fellows have become listless and less entertained by the wonders of the technology around us. That's why Apprentice Watkins is such a joy to work with. Her unbridled enthusiasm for virtual combat is unparalleled." (Lars Taggart's dialogue)