In 1980, he collaborated with Brian Eno on the album Fourth World, Vol. 1: Possible Musics and appeared on the Eno-produced Talking Heads album Remain in Light. Hassell's 1981 release, Dream Theory in Malaya, led to a performance at the first World of Music, Arts and Dance (WOMAD) Festival, organized by Peter Gabriel. He performed and co-wrote tracks on David Sylvian's first solo album Brilliant Trees, and its instrumental follow-up Words with the Shaman. In the late 1980s, Hassell contributed to Gabriel's Passion: Music for The Last Temptation of Christ, the soundtrack album for Martin Scorsese's film, The Last Temptation of Christ. Hassell and Pete Scaturro composed the electronic theme music for the television show The Practice. In 1989, Hassell contributed to the Tears for Fears album The Seeds of Love.