Marsh worked at DARP as an assistant to Dallas and Sheppard, engineering recordings for Natalie Cole, George Clinton, Joss Stone, Sugababes and Lionel Richie.
He has engineered, produced and given his multi-instrumentalist talents[7] to a very long list of well known megastars including Asher Roth, Fantasia, Leona Lewis, Estelle, Nas, Travie McCoy, The Constellations, Plies, Ciara, Amerie, Juvenile, Ludacris, "Rick Ross", Common, Novel, Kelis, Kid Cudi, Chase & Status, The Teddybears, and Bruno Mars.
Marsh and CeeLo Green formed the production team The Grey Area to work on music that would be mainstream hits.
He collaborated on Gnarls Barkley's The Odd Couple and CeeLo's 2010 multi-platinum smash "Fuck You" from The Lady Killer album.
[13] Marsh met Amber Renee in summer of 2013, and the pair started writing songs together under the name CLAWS (eventually changed to CLAVVS).