By 1984, Birch was living in Los Angeles, where he joined the band
Fortune, playing bass and
saxophone on their first album
Fortune, an album which is considered a classic in
Progressive rock circles. The album was a success in Japan and Europe, and the song "Stacy" was a hit in the US, but the band broke up soon after its release. Birch met keyboardist
Guy Babylon when they worked on the
Luis Cardenas's 1986 album,
Animal Instinct. In 1987, Babylon recommended Birch for
Mark Ashton's band and the two worked on the recording of the 1988 Ashton album
Modern Pilgrims. At that time, Babylon was asked to join
Elton John's band. When Elton John ended his tour in 1989, Babylon produced an album for Warpipes, a side band that he had started with John's guitarist,
Davey Johnstone, and John's drummer
Nigel Olsson. Babylon hired Birch to play on the album, which was released in 1991. Babylon, Johnstone and Olsson were then called to begin working on Elton John's
The One. At that point, John had been working with different bass players, including Romeo Williams,
David Paton and
Pino Palladino, but he had yet to settle on one musician. Birch was asked to join
The One Tour, which commenced in May 1992. While he would become a busy session musician when not working with Elton John, Birch would stay with John for the rest of his life. In 1997, Birch met
Marc Bonilla and briefly played with his band Dragonchoir. Through Bonilla, Birch was hired to play with
Keith Emerson and
Glenn Hughes. He worked with Bonilla on Bobby Gaylor's comedy album,
Fuzzatonic Scream, and on the soundtracks of the films
The Replacements and
The Scorpion King. Bonilla included a track featuring Birch on his 2019 album
Celluloid Debris. With his 2022 album
Deeper Than My Roots, Davey Johnstone would do the same. During the Elton John and Billy Joel's
Face to Face 1994 tour, Birch met Joel's saxophone player
Mark Rivera. In 1997, Rivera asked him to play at the inaugural
Rock & Roll Fantasy Camp in Miami Beach, where Birch played with Rivera,
Leslie West and
Liberty DeVitto. In 1999, Birch was part of
Edgar Winter's opening band at the
Montreaux Jazz Festival. He also built a relationship with producer and songwriter David Harris, through which he did session work on several
Contemporary Christian music albums. Birch's last album was
Remember, released by
Micky Dolenz in 2012. ==Injury==