Olajide Olayinka Williams "JJ" Olatunji (born 19 June 1993), known professionally as KSI, is an English YouTuber, rapper and boxer. He is a co-founder and member of the British YouTube group known as the Sidemen. He is the CEO of Misfits Boxing and the co-owner of Prime energy drink, XIX Vodka and a restaurant chain known as Sides.

KSI in 2020
Olajide Olayinka Williams Olatunji

(1993-06-19) 19 June 1993 (age 29)
London, England
  • YouTuber
  • rapper
  • songwriter
  • boxer
  • actor
YouTube information
Years active2009–present
Subscribers24 million (main channel)
41.53 million (combined)[lower-alpha 1][1]
Total views5.95 billion (main channel)
10.55 billion (combined)[lower-alpha 2][1]
Associated actsSidemen
100,000 subscribers 2011, 2012
1,000,000 subscribers 2012, 2013
10,000,000 subscribers 2015, 2020

Last updated: 23 January 2023
Musical career
Years active2015–present
Boxing career
Nickname(s)The Nightmare[3]
Height5 ft 10 in (178 cm)[4][note 1]
Reach76 in (193 cm)[4]
Boxing record
Total fights1

KSI registered his main YouTube account in 2009 and built a following posting gaming commentary videos of the FIFA video game series. His YouTube content later diversified to include vlog and comedy-style videos. As of October 2022, he has over 41 million subscribers and over 10 billion video views across his three YouTube channels.

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, and KSI: In Real Life (2023), an Amazon Prime Video documentary film following his life from June 2021 to October 2022.

He was involved in two further boxing events against American YouTuber Logan Paul, the second of which was a professional bout. On 27 August 2022, he was involved in two crossover boxing bouts against British rapper Swarmz and Mexican boxer Luis Alcaraz Pineda on the same night, both of which he won by KO. On 14 January 2023, he fought Faze Temperrr in a crossover boxing bout, which he won via KO in the first round.

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