Professor Tolen Ren was a 24th century Banea scientist.
By 2371, Ren was among the top Banea engineering physicists and the principal inventor responsible for Banean warship technology and weapons research. Professor Ren had developed four generations of navigational arrays for Banean ships. He was married to Lidell Ren.
In 2371, Professor Ren offered to help the crew of USS Voyager replace its damaged collimator. Ren was able to help; however, Voyager's visit was used as an opportune moment by Numiri operatives to steal his weapons research by murdering Ren and framing Tom Paris for the crime. The culprits were exposed by Lieutenant Tuvok as Ren's own wife Lidell and the Banean doctor who had implanted Ren's memories into Paris, and they were both arrested. (VOY: "Ex Post Facto")
Tolen Ren was played by actor Ray Reinhardt.