Selek'held was an officer in Starfleet in the late 23rd century. He served as a science officer aboard the USS Palmares under Captain Jaulas nd'Omeshef.
In 2279, Selek'held collaborated with the team that developed a weapon to counter the Naazh. The weapon itself contained a miniaturized version of Doctor Tristan Adams' neural neutralizer mechanism. a technology that had been restricted based on the recommendation of then-Captain James T. Kirk. However, they were given a special dispensation for the sake of the emergency. (TOS novel: The Higher Frontier)