After graduating from audio engineering at AFTRS Lachlan worked as an assistant engineer at London’s prestigious AIR Studios under the management of Beatles producer George Martin. There he assisted on albums for musicians including Nik Kershaw, Phil Collins, John Martyn and Johnny Diesel. On returning to Sydney he has worked on recordings for artists including The Jezabels, Little Bastard, The Vines, The Hard-Ons, Billy Thorpe, Nitocris, Something with Numbers, One Dollar Short, Enola Fall and The Whitlams.
Described as a "deep-thinking, conceptual kind of producer," he recorded and produced the critically lauded EPs and Australian Music Prize-winning debut album “Prisoner” by The Jezabels; all four releases have gone gold. In 2012, Lachlan received ARIA nominations for Producer of the Year and Engineer of the Year for his work on the album. Triple J described Prisoner as “the most epic and anthemic Australian album of 2011.” The band has credited him with bringing together their disparate sounds and diverse interests, and helping to produce their signature “sweeping, cinematic,” “grandiose, expansive soundscapes.”
The Mercury describes Lachlan as “himself a bundle of contradictions who loves pop divas by day but plays in a black metal band by night,” referring to his long-standing association with Nazxul. As a musician Mitchell plays various instruments including keyboards, bass, guitar, and vocals, and has played in bands including Nazxul, Guns Are For Kids and Brace.