White replaced the Zombies' initial bassist, Paul Arnold, and became one of the band's two main songwriters, alongside Rod Argent. He wrote two tracks on their USA debut LP, The Zombies, released in January 1965. On the UK debut release, Begin Here, he had three tracks. For the Zombies' performances in the 1965 film Bunny Lake Is Missing White wrote "Nothing's Changed" and "Remember You". He also wrote seven of the twelve songs on the group's final album and generally acknowledged masterpiece, Odessey and Oracle. White also contributed lead vocals to "Butcher's Tale (Western Front 1914)" and a verse of "Brief Candles".
His song "I Love You", originally recorded by The Zombies in 1965, was a hit for the band People! in 1968.
Following the demise of The Zombies, White contributed songwriting and production work to Colin Blunstone's solo career and Rod Argent's new band, Argent. With Argent he cowrote their 1972 hit "Hold Your Head Up". In a later role as a record company A&R man, he was instrumental in discovering the band Dire Straits. In 2007, as part of the group White Circle, he co-wrote, co-produced and performed on the album The Key. Key members of White Circle are Chris White, Matthew White, Vivienne Boucherat, and Bianca Kinane.
Also in 2007/2008, White co-produced and played on the album Featherhead for his youngest son, the London-based singer/songwriter JJ White. In March 2008, White began a series of live performances with the other three surviving members of The Zombies, including the first complete performances of the album Odessey and Oracle, in celebration of the 40th anniversary of its release.