Olajide Olayinka Williams “JJ” Olatunji, born 19 June 1993, better known as KSI, is a British YouTuber and rapper. He is a co-founder and member of the British YouTube group known as the Sidemen. He is also the co-owner of Prime Hydration, XIX Vodka and a restaurant chain known as Sides.
KSI’s 2020 debut studio album, Dissimulation, debuted at number 2 on the UK Albums Chart. His second studio album, All Over The Place, debuted at number 1. He has achieved fourteen top 40 singles on the UK Singles Chart, seven of them ending up in the Top 10 and five of them ending up in the Top 5. KSI featured in the British comedy film Laid in America (2016), and was the subject of KSI: Can’t Lose (2018), a documentary film following the build-up to his first amateur boxing fight against British YouTuber Joe Weller. He was involved in two further boxing events against American YouTuber Logan Paul, the second of which was a professional bout.