Mathilde Dehaye was born in the small city of Liège (Belgium), where she took dancing classes for over a decade, trained in improvisation, and performed in various plays throughout the years. She also played some violin, sang, painted on silk and wrote poetry. 

Two months after graduating from high school, she took a leap of faith and made her way to New York City to pursue her dreams. 
She first studied Meisner at The Acting Studio under James Price, then completed a "One Year Acting for Film Conservatory" program at The New York Film Academy, and finally graduated with a "Two Year Acting Conservatory" diploma from The Lee Strasberg Theatre & Film Institute. 
 
From 2018 to 2019, Mathilde portrayed the pivotal character of Amity in both seasons of the J.J. Abrams & Stephen King hit anthology series Castle Rock for Hulu.
From 2021 to 2022, she played the mystifying character of Snake for the last two seasons of Servant, the electrifying Apple Tv+ series run by M. Night Shyamalan.
 
She’s been called "absolutely hypnotic" by John Saavedra of Den of Geek!, "magnetic"  by Cheryl Eddy of Io9, and "fearless" by Darek Thomas of Monday Morning Critic Podcast.

Mathilde also finds much joy and inspiration in her writing.
She won The Strasberg Works Award for her first full length play Snow White and The Beast, which was tapped for production Off-Broadway in NYC, directed by Renoly Santiago (Hackers, Con Air, Daylight).
She then wrote and played the lead in her first short film, Rhythm in Me, which ended up at The Cannes Short Film Corner as well as at The Palm Springs International ShortFest, directed by Niav Conty (Small Time, Joy Ride,Outworld). Later that year, Mathilde wrote and acted in Free Your Mind, Free Yourself, a show featuring different forms of visual arts which she put together with a few other creatives.