Grech started working at
RAK Studios in
St John's Wood, London as an assistant recording engineer. He worked with record producer
Nigel Godrich for two years, co-written by
Elton John, which went to number one in 8 countries, top 10 in 20 countries, and was certified 2x platinum in the UK. Grech initially joined the project to assist with recording live instruments but eventually took on a larger role, including mixing. Later that year, Grech mixed the debut record for the band
Dragonette, starting a long-term relationship with the band. In 2007, Grech produced two tracks for the
Radio 1 Established 1967 anniversary album, one for
The Kooks and one for
The Kaiser Chiefs. He went on to produce several tracks for
The Kooks second album
Konk, and also mixed the Moby album ''
'Last Night''. In 2009, Grech won the
Grammy Award for Best Alternative Music Album for engineering
Radiohead's
In Rainbows. He also received a Grammy nomination for
Album of the Year for his work on the album. Grech mixed the majority of
Lana Del Rey's 2012 album
Born to Die, Grech produced and mixed
Keane's fourth studio album ''
'Strangeland''', released in 2012. In 2013, Grech produced
Long Way Down, the debut record for
Tom Odell and winner of the
BRITs Critics Choice Award. Grech also produced Tom Odell’s 2012 debut single “Another Love”, which went viral on TikTok and other social media platforms ten years after its release, and as of February 2026 is the 23rd most streamed song in the world on
Spotify, with over 3.4 billion streams. In 2013, Grech also produced
The Brink, the second album for the Australian band
The Jezabels. In 2014, Grech worked with Liverpool-based guitar band
Circa Waves. He produced and mixed their debut album which entered the UK charts at number 10 in April 2015. Singles from the album included
Fossils and
T-Shirt Weather. In 2015, he produced and mixed the Birdy and Rhodes duet
Let It All Go. At the start of 2016, Grech worked with
Mumford & Sons. He recorded the
Johannesburg EP in South Africa with the band. Grech's releases in 2017 included
Liam Gallagher's debut solo album
As You Were, he produced 8 of the 12 tracks including the single ''For What It's Worth''. That year, he also mixed
The Killers' single "
The Man", and went platinum in the US in 2024. In 2018, Grech mixed ''
Staying at Tamara's'',
George Ezra's second album, including the single "
Paradise". In the same year, he also mixed releases for
Rae Morris,
Mikky Ekko, and
Tom Grennan. Grech has worked frequently with country pop singer
Kelsea Ballerini. He mixed her 2020 album
Kelsea, which includes duets with
Halsey,
Shania Twain, and
Kenny Chesney. He mixed the 2021 single "
I Quit Drinking" by Ballerini and
LANY, which was certified platinum in the US in 2026. Grech mixed Ballerini's 2023 album
Rolling Up the Welcome Mat, earning a CMA Award nomination for Album of the Year for his work on the album, which was also nominated for a
Grammy Award for Best Country Album. Grech mixed five songs on Ballerini's 2024 album
Patterns, which was nominated for a Grammy Award for Best Contemporary Country Album. In 2021, Grech produced
Tom Grennan's album
Evering Road, and mixed the 2021
Muna and
Phoebe Bridgers single "Silk Chiffon". mixing Ryder's debut EP
Sun’s Gonna Rise. Grech mixed and produced the UK
Eurovision entry song for
2022, Ryder's ''There's Nothing but Space, Man!''. Grech won Mix Engineer of the Year at the 2021
Music Producers Guild Awards, and was nominated for the award in 2022, 2023, and 2024. Grech mixed several tracks on Tom Grennan's 2025 album ''
Everywhere I Went, Led Me to Where I Didn't Want to Be'', including the singles "Boys Don't Cry" and "
Full Attention". The album reached number one on the
Scottish Albums Chart and
UK Albums Chart. ==Awards and nominations==