Porteils experienced great success writing for huge artists such as Cher, having helped produce her 3× platinum album Heart of Stone which peaked at number 10 on the US Billboard 200, by contributing to the song “If I Could Turn Back Time”, which went to number 1 on the Billboard Hot 100. He also has produced Billy Idol’s top 10 hit “Cradle of Love” from the album Charmed Life, Tevin Campbell’s top 10 hit Back to the World, Guns n Roses’ number 1 hit “Knockin’ on Heaven’s Door”, Terence Trent D’arby’s Symphony or Damn, Rod Stewart’s “Rhythm of My Heart”, Ozzy Osbourne’s No More Tears, and Richie Sambora’s “One Light Burning”.

Porteils has been the production manager and composer of many American film scores and soundtracks, such as Parenthood, directed by Ron Howard and starring Steve Martin, Frankie and Johnny, starring Al Pacino, Three of Hearts, Johnny Handsome, starring Micky Rourke, and Cry-Baby, starring Johnny Depp.

In 1996, Porteils returned to Australia to work in the music industry of his native country. He has participated in the production of the popular show Australian Idol and produced albums for Shannon Noll and Guy Sebastian. Some of his Australian collaborations include Diesel, Cactus Child, Wendy Matthews, Shortstack, David Campbell, Deni Hines, Ultimo, Damien Lieth, Young Divas, Joel Turner, Michala Banas, The Noll Brothers, The Jefferson and Human Nature.