In 2139, he was one of the first people to test his father's sub-quantum teleportation device. Unfortunately, his pattern was lost in subspace in an area called the Barrens. However, Emory learned that there were fluctuations within the subspace node of the Barrens, which caused Quinn's transporter signal to reappear, manifesting itself as an energy distortion. Emory was then convinced that his son was still alive, suspended in subspace, and could be rescued.
In 2154, Emory staged a ruse and convinced Starfleet that he was running another test of the sub-quantum transporter. In reality, however, he was attempting to lock onto his son's signal and bring him back to normal space, a mission he believed Starfleet would have never authorized. Starfleet granted Emory access to Enterprise NX-01, under the command of the now-Captain Archer, which returned the inventor to the Barrens to conduct the experiment.
While Emory made the preparations to modify the Enterprise transporter, Quinn's signal manifested itself aboard the vessel and resulted in the death of Crewman Burrows. Emory, when confronted by both his own daughter and Archer, finally revealed the truth, and Archer reluctantly permitted Emory to continue with the experiment.
Emory was ultimately successful in locking onto Quinn's pattern. When Quinn's body materialized in a deteriorated state, completing the transport process would surely kill him. Rather than let his son exist "somewhere in-between" life and death, Emory brought him back to normal space, wishing to hold him one last time and say goodbye. Quinn died in his father's arms. (ENT: "Daedalus")