John Greenham is the principal engineer at Clearlight Mastering. Originally from the UK, John has worked in the San Francisco Bay Area, and more recently in Los Angeles. These days he can be found in Clearlight Mastering's main studio in Hollywood.

John is a four-time Grammy winner and has received many Grammy, and Latin Grammy nominations and certificates for his work. Over the years he has worked on projects from a diverse group of artists including: Billie Eilish, Finneas, Bo Burnham, Ice Cube, Lady Gaga, Gwen Stefani, Billy Idol, Miguel, Mura Masa, Girl in Red, Sigrid, The Marías, Gracie Abrams, Nessa Barrett, K. Flay, Cautious Clay, Steve Lukather, Los Tigres del Norte, Los Cojolites, Omar Sosa Take That, and more.

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