Marcie Michelle Free, one of the world's most reknowned transgendered vocalists, first appeared on the world stage with King Kobra on Capitol Records in 1985. Following her tenure in the group Signal on EMI Records in 1989, she became a founding member of Unruly Child, which released its debut record on Interscope/Atlantic in 1992. She released a solo record as Mark Free entitled “Long Way From Love” in 1993, and another solo record as Marcie Free titled “Tormented” in 1996.

Bruce Gowdy, guitarist/producer, released his first record with Stone Fury on MCA in 1985, then founded World Trade in 1989. World Trade's influence in Gowdy's writing and arranging gives Unruly Child its progressive side and its unique twist, as does Allison's crucial songwriting and performance skills.

Guy Allison, keyboardist, is one of the bands major writing contributors and has been one of the world's most sought-after keyboard players for many years. As one of the Doobie Brothers, Guy Allison has been actively recording, producing and touring with the band for the past 15 years. He has also performed and recorded with other reknowned artists such as Boz Scaggs, Air Supply, and The Moody Blues.

Jay Schellen, drummer/percussionist, who also worked with Gowdy in 1995, joined World Trade for their second album Euphoria, and reunited again in 1998-1999 with the release of a second Unruly Child album minus Free but with Kelly Hansen on vocals (Hurricane, Foreigner). In 2004, Schellen worked on pre-production for Asia's album Silent Nation with Geoff Downes (Yes). In August 2005, Schellen replaced Chris Slade as drummer in Asia.

Completing the lineup is bassist Larry Antonino. Before joining the band in 1992, Antonino played with many well-known artists, including Ambrosia. Based on his favorable experience with Antonino in Air Supply, Allison recommended him when it came time to fill the bass player position. In addition to being one of the world's most well-regarded bass players, Antonino has pursued acting, with his most notable role being that of "The Wolfman" in the movie "That Thing You Do" starring Tom Hanks.

Marcie Michelle Free, Bruce Gowdy, and Guy Allison are now back together again in 2019 and have written and recorded a new album entitled “Big Blue World".

Joined by legendary fretless bass player Tony Franklin (ex-Blue Murder, The Firm) and drummer Jay Schellen, Unruly Child return with their new album “Our Glass House” on December 4, 2020.