Setheleyis th'Rasdeth (or Sethel for short) was an Andorian counselor in the mid-to-late 24th century. He died at the age of 58. He had an unconventional approach to counseling, that helped Jadzia Dax in her decision to return to the Trill symbiont initiate program when she had been rejected by Curzon Dax. He and Dax would often visit Rio de Janeiro. He was also a professor at Starfleet Academy. One of his students, Julian Bashir, took his class on "the benefits of positive visualization in psychotherapy".