Gyasi was born 2 January 1980[2] in Hammersmith, London, one of seven children to Ashanti Ghanaian parents[3] who had arrived in England in 1966.
[7] Gyasi landed his first main television role as Jeremy Hands in the 2005 ITV comedy Mike Bassett: Manager, a follow-up to Mike Bassett: England Manager (2001), and his first major film role that same year in Michael Caton-Jones' Shooting Dogs.
This was followed by roles in the BBC One television film The Whale (2013) and Christopher Nolan's Interstellar (2014), the latter of which earned him a Black Reel Award nomination for Best Breakthrough Performance.
[11] He also led the Western film Hell on the Border[12] and appeared in Cold Blood, Maleficent: Mistress of Evil, and Come Away.
Gyasi began dating his wife Emma (née Llaudes) during sixth form at East Berkshire College.