Inspired by his father, sculptor George Foster, and growing up in art studios surrounded by his father’s work, Marcus immersed himself in fine arts studies early on. For six years, he specialized in sculpture at the Chelsea College of Art and completed an MA at The Royal College of Art. At the end of his studies at RCA Charles Saatchi discovered his work and promptly snatched up one of his creations, which was shown in a exhibition of emerging British artists called Newspeak: British Art Now. His work has been bought and shown in galleries across Europe, including group shows in Greece and Italy, and was featured on the front cover of the British Art Guide Book to museums and galleries in London.

Foster’s music showcases a powerfully unique and varied range of influences, which has led The Sunday Times to state that his sound is a mix of “Prince meets D’Angelo meets Tom Waits meets Joe Cocker”. After signing to Communion Records in 2010, his first EP Tumble Down (2011) achieved critical acclaim. Foster’s debut album Nameless Path was recorded in the legendary Rockfield Studios (Queen, Led Zeppelin) in Monmouth under the expert supervision of Ian Grimble and Mumford & Son’s Ben Lovett, and was released in conjunction with Polydor Records. His next single I Was Broken clocked millions of views and featured actress Kristen Stewart in the music video. After these releases, Foster appeared on multiple tours across the US with the likes of Michael Kiwanuka, Ben Howard, Nathaniel Rateliff, and Bahamas, and performed on Late Night with Jimmy Fallon with The Roots in 2012. After playing packed out showcases at SXSW with Ed Sheeran, Foster went back into the studio and recorded The Last House EP (2012) in Barn in Sussex.

Having gone through a personal family tragedy while recording his second album in 2014, a new project was beginning to emerge. Seramic was the start of a new creative direction and era for Foster, combining his love for legendary funk and soul singers of the 70’s and 80’s along with the 90’s RnB music he grew up listening to. Seramic exploded onto the scene with his first single People Say (2015), garnering radio play across BBCR1, BBC1XTRA, BBC6Music, Radio X, Virgin, KCRW, Absolute Radio, and was named in “Annie Mac's New Names”. After the success of his next singles Waiting and Found, Seramic released his debut EP Found in 2016 to rave reviews, receiving coverage by Noisey, The Sunday Times, The FADER, Complex, OkayPlayer, and beyond.

After receiving buzz in the industry, Seramic was discovered by legendary A&R Nick Huggett, who had previously discovered and signed Adele, MIA, and Dizzy Rascal. Seramic signed with Huggett to Parlophone Warner Music Records and released his next EP I Got You (2017), catching the ear of legendary producer Rick Rubin who met with Foster to hear his music and story. Most notably, Seramic received a seal of approval from funk bass master Bootsy Collins himself (James Brown, Funkadelic) who is featured on the frantic 2016 single Greg’s Love, stating “You ain’t never heard no funk like this”.

Seramic then signed a publishing deal with B-Unique and has had syncs featured on Grey’s Anatomy, Apple Music, BT Sport, and Fox Sports. He supported various UK acts like Jack Garratt and Bears Den in 2016-2017 and played UK and EU festivals including R1 Big Weekend, Latitude, Lovebox, Eurosonic, Reeperbahn, and the main stage at Nice Jazz Festival.

In 2018, Foster released the single Strange Magic and received the PRS Momentum Fund award. Having spent years writing and recording Seramic’s debut album which was slated to arrive in 2020, the world witnessed a global pandemic with COVID-19. Foster held off on its release and focused on producing, collaborating, and songwriting with other artists. After a lengthy four-year hiatus, Seramic is back and in 2023 released the single Ride or Die, which was featured in Wonderland Magazine and Clash Magazine, stating Ride or Die is “a burst of fun, sunshine energy”.

Marcus contributed to “Let Me Sign” sung by Robert Pattinson (2008) for Twilight, and wrote and performed two songs in Five Dollars a Day (2008) starring Christopher Walken and Sharon Stone.

He has written music, collaborated, and produced for notable artists including Suki Waterhouse, Izzy Bizu, Rhys Lewis, Alex Vargas, Alextbh, Gallant, Ainé, Albin Lee Meldau, and Morly, which have had millions of plays across the globe.

As a burgeoning score writer for film and dance, Foster constantly creates imaginative, evocative score sketches. In fall 2022, he created an original score for New York choreographer Loni Landon’s full-length work Flock, Go Forth, which premiered alongside work from Bill T. Jones at SUNY Purchase College’s fall dance concert. In 2024 he scored a film and made all the sound design for Gibney Dance Company Artistic Associates 2023-2024 collaborating with director and choreographer Amy Gardner, produced by Cameron Sczempka. He is currently researching and working on his first score for a feature film about a man who learns the language of mosquitoes.

Foster directs all of his music videos for his musical project Seramic. His video I Got You was nominated for the Berlin Music Video Awards and his work has been screened at Raindance Film Festival. In 2017, Foster traveled to Hong Kong to direct a video for his single Same Mistakes, which was written by his long-time collaborator Christopher Stracey (Bag Raiders) and grammy-winner Tobias Jesso Jr. The video premiered in Wonderland Magazine and stars Angela Hang, a famous dancer and choreographer and the founder of Hong Kong’s Studiodanz dance school.