Teft ended up in the bridge crews of Sadeas warcamp on the Shattered Plains. He blames himself for destroying the Envisagers. After committing infraction he was transfer to Bridge Four, where Kaladin befriended him and he ended up in his inner circle along with Rock, actively helping him in his plans.
Teft was the first to suspect Kaladin might be able to use stormlight, saving Kaladin's life in the process. He learned this by (amongst other things) pushing a dun sphere into Kaladin's hand, claiming it to be "For luck" just before Kaladin was to be left outside alone to face "the judgement of the Stormfather" by way of the highstorm. After the storm the sphere Kaladin had been given appeared to still be dun, even though it should have been infused with light by the highstorm it was left outside during, leading Teft to muse, "An empty sphere after a storm, he thought. And a man who's still alive when he should be dead. Two impossibilities." That meant Kaladin had "stolen" the light that infused the sphere, which left Teft almost certain that Kaladin had the ability to infuse stormlight and that Kaladin was part of the events the Envisagers had been waiting for. When Kaladin was recovering from his wounds and fever after the highstorm, Teft brought three small infused diamond spheres and pressed them into Kaladin's hand, waiting anxiously to see what would happen. When Teft had nearly lost hope of being right about the events and their meaning, Kaladin drew in a short powerful breath infusing himself with stormlight and began to glow from the leaking stormlight. Teft knowing there was a healing effect to the stormlight repeated this treatment enough as to not draw suspicion from the other bridgemen, and ten days after the hanging in the highstorm, Kaladin arose. These revelations sparked a heavy curiosity in Teft, prompting questions that indirectly asked if Kaladin was willing to discuss his use of stormlight, or if he was aware of his own abilities. At one point, Kaladin was handed a bag of infused spheres, Teft then threw a surprise punch at Kaladin to cause a reflexive infusion, which worked, and led both Kaladin and Lopen to notice the soft glow coming from Kaladin's skin. Not to mention Kaladin realizing his familiar surge of strength and focus. After time passed and they were both certain of Kaladin's abilities. Teft with the aid of Lopen, (seeing as he had become privy to the secret) and to some degree Syl, worked with Kaladin to help understand and trigger his new found powers.  He shared with Kaladin what he knew about Radiants and their ways, from his youth in the Envisagers. He was also the one to tell Kaladin the words of [the first ideal]. Kaladin seemed to almost (whether by instinct or experience is not clear) understand the meaning and reasoning behind the words, and once spoke them just before infusing himself with stormlight. Later, after Kaladin spoke [the second ideal] and a thundercrack like sound was heard, Teft understood it to be something in the world changing.
During his many conversations with Kaladin he stated time and again he isn't to be trusted. Either due to the events that lead to the fall of the Envisagers, or some other unknown event.
Kaladin discovered Teft had military experience and was a sergeant before becoming a bridgeman. He became invaluable to Kaladin's leadership, by playing sergeant to Kaladin's captain, taking command when asked, ordered, or during times Kaladin was indisposed, Teft assumed command of the bridgemen. His military experience was never divulged in great detail, as the history of bridgemen's personal lives seemed to be their most guarded secret.
Appearance and Personality
He is long past his twenties. He has tan skin, drooping cheeks, brown eyes with an epicanthic fold, and close-cropped, grizzled white-salted hair. He keeps a neat, short and square beard that is light brown, mixed with patches of gray.