As a member of Tease, Salas developed songwriting and arranging skills that would later aid him in producing recordings for multi-platinum artists including Vanessa Williams (for “The Right Stuff,” which earned Salas a Grammy nomination), and Boyz II Men (for “It’s So Hard To Say Goodbye to Yesterday”, the 1991 song that was featured on the soundtrack to Lethal Weapon 3 and that at the time was the group's biggest-selling single).
Through the years Salas has continued to use his expertise in musical direction and as a keyboardist, and playing keyboards on two of singer Robert Palmer's major tours in the late 1980s as well as music-directing three Janet Jackson world tours, including Jackson's 1998 HBO TV special: The Velvet Rope: Live in Madison Square Garden, for which Salas was nominated for an Emmy award in the category Outstanding Music Direction for a TV show.
In 2009, Salas worked with The New York Symphonic Ensemble's 37 piece orchestra on a live tour with Boyz II Men in Japan.
[4] In 2009, Rex musical-directed a show for Justin Timberlake at Elton John's Aids Charity benefit in London, England, and he also worked with Timberlake on his first Shriners Hospitals for Children benefit in Las Vegas, Nevada, in 2008, at which Salas was musical director for guest artists Lionel Richie, Rihanna, will.i.am, Leona Lewis, 50 Cent, Boyz II Men and Adam Levine, the lead singer of Maroon 5.
On July 25, 2005, Rex and wife Stacee Brown (daughter of Rebbie Jackson) welcomed their son, London Blue Salas.