In the 2350s, Rixx met Captain Jean-Luc Picard at the Altarian Conference. As of 2364, Rixx held the rank of captain and was commanding officer of the USS Thomas Paine. In that year, Rixx was one of a select few in Starfleet who knew about an alien conspiracy to take control of Starfleet Command. He met Captains Jean-Luc Picard, Walker Keel and Tryla Scott on the planet Dytallix B to discuss the situation.
In early 2378, Rixx was one of several Starfleet officers present at the first official debriefing of Captain Kathryn Janeway after her ship, the USS Voyager, returned from the Delta Quadrant.
Rixx retired from Starfleet sometime before 2380, and wrote a book on first contact situations called The Ripple Effect. In May of 2380, he appeared as a panelist on Illuminating the City of Light to discuss Federation President Nanietta Bacco's impending diplomatic meeting with the Trinni/ek.