Olajide Olayinka Williams "JJ" Olatunji ( born 19 June 1993), known professionally as KSI, is a British influencer, musician, and former professional boxer. He is a co-founding member of YouTube group the Sidemen, the co-founder of Misfits Boxing and co-owner of several businesses, including Prime Hydration and Lunchly. KSI has also served as a judge on ''Britain's Got Talent'' since 2026.
Person · Open Library
- Born
- 1993-06-19
- Works
- 3
Top works
- KSI - I Am a Bellend
- I Am a Tool
- KSI
via Open Library + Wikidata
Film & TV
Acting · Watford, England, UK
Olajide Olayinka Williams "JJ" Olatunji, known online as KSI, is a British YouTuber, internet personality and rapper known for his YouTube video content. Olatunji is a member and co-founder of the entertainment collective known as the Sidemen, alongside six other British YouTubers, producing online videos and merchanise to a combined audience of over 53 million followers.
Known for
- Road to Glory — Self2026
- Race to the Top — Self2026
- TFI Unplugged — Self2026
- Paul American — Self2025
- Inside: USA — Self - Host2025
- The Sidemen Story — Self2024
- Inside — Self - Host2024
- Dare to Dream: The Luis Pineda Story — Self2023
- WrestleMania 39: Saturday — KSI (Ringside)2023
- KSI vs. Joe Fournier — Self2023
via TMDB
Listeners · Last.fm
- Listeners
- 714,696
- Total plays
- 17,908,339
Tags
rapHip-HopGrimehip hoppop
Olajide Olayinka Williams "JJ" Olatunji, better known as KSI, is an English YouTuber, internet personality, musician, and boxer. He is also part of the British YouTube group known as the Sidemen. In 2019, he was ranked second by The Sunday Times in its list of the top 100 UK influencers. KSI registered his main YouTube account in 2009 and built a following posting gaming-commentary videos of the FIFA video game series. As his fan base has grown, his YouTube content has diversified to include vl
via Last.fm · KSI
Recent publications · Crossref
5 total works indexed
- The impact of socioeconomic deprivation on the uptake of colorectal cancer screening in London
· 2020 · cited 18x
- Synthesis of unsaturated epoxyfumarate and epoxymaleate resins
· 1999 · cited 7x
- Telomerase Modulation in Therapeutic Approach
· 2014 · cited 7x
- Synthesis and properties of unsaturated epoxyfumarate resins
· 2000 · cited 6x
- Experimental Studies of Longitudinal Demixing of Plasma Components in a Wall-stabilized Arc
· 2000 · cited 3x
via Crossref · CC0
Key facts
- Social media personality.name
- KSI
- Social media personality.image
- KSI in 2024.png
- Social media personality.caption
- KSI in 2024
- Social media personality.birth_name
- Olajide Olayinka Williams Olatunji
- Social media personality.birth_place
- London, England
- Social media personality.education
- Berkhamsted School
- Social media personality.signature
- KSI sig.svg
- Social media personality.youtube_id
- UCVtFOytbRpEvzLjvqGG5gxQ
- Social media personality.youtube_display_name
- KSI
- Social media personality.youtube_years_active
- 2009–present
- Social media personality.stats_update
- 28 March 2026
- Musical artist.embed
- yes
Key dates
- Born
- 19 June 1993
via Wikidata · CC0
Wikidata facts
- Instance of
- human
- Gender
- male
- Citizenship
- Nigeria
- Place of birth
- London
- Occupation
- actor
- Languages spoken
- English language
- Religion
- agnosticism
- Instrument
- voice
- Sport
- boxing
- Official website
- shopksi.com
Article
43 sectionsContents
- Early life
- YouTube and online career
- 2008–2013: Beginnings and ''FIFA'' videos
- 2013–present: Sidemen and expanding content
- Music career
- 2015–2016: Early releases
- 2017–2019: Independent releases
- 2019–2020: New record label signing and ''Dissimulation''
- 2020–present: ''All Over the Place'' and new releases
- Boxing career
- Starting influencer boxing against Joe Weller
- Two bouts against Logan Paul
- Return after hiatus
- KSI vs Swarmz & Pineda
- KSI vs Temperrr
- KSI vs Fournier
- First defeat against Tommy Fury
- Cancelled bouts and second hiatus
- Other ventures
- Film and television career
- Business ventures
- Video games
- Writing
- Wrestling
- Personal life
- Income and wealth
- Charity
- Boxing record
- Professional
- MF–Professional
- Amateur
- Pay-per-view bouts
- Filmography
- Ludography
- Discography
- Concert tours
- Bibliography
- Awards and nominations
- World Records
- Listicles
- Notes
- References
- External links
Olajide Olayinka Williams "JJ" Olatunji ( born 19 June 1993), known professionally as KSI, is a British influencer, musician, and former professional boxer. He is a co-founding member of YouTube group the Sidemen, the co-founder of Misfits Boxing and co-owner of several businesses, including Prime Hydration and Lunchly. KSI has also served as a judge on ''Britain's Got Talent since 2026.
Born in London to parents of Yoruba heritage and raised in Watford, KSI was privately educated at Berkhamsted School. He registered his main YouTube channel KSI—then known as KSIOlajidebt—in 2009 and built a following through his commentary videos of the FIFA video game series. His content later diversified to include vlogs and comedic skits. In 2019, he was ranked second by The Sunday Times in its list of most influential online creators in the United Kingdom. In 2021, he was listed in the Europe Entertainment category of Forbes 30 Under 30; he was later ranked by Forbes as the second-top creator of 2023. As of January 2025, he has over 44 million subscribers and 14 billion video views across his three active YouTube channels.