About
Olajide Olayinka Williams "JJ" Olatunji, known professionally as KSI, is a multi-faceted English influencer, musician, and former professional boxer. He gained initial fame through his YouTube presence and as a co-founding member of the Sidemen. Beyond entertainment, KSI has also ventured into business, co-founding Misfits Boxing and co-owning Prime Hydration and Lunchly. His diverse endeavors have made him a prominent figure in both the online and entrepreneurial worlds.
Career Timeline
YouTube Channel Launch
KSI launched his YouTube channel, building an initial following through gaming videos.
Sidemen Co-Founder
KSI co-founded the Sidemen, a popular YouTube group, further expanding his reach.
Music Career Launch
KSI began his music career, releasing several successful singles and albums.
First Boxing Match
KSI participated in his first high-profile boxing match against Joe Weller, increasing his mainstream appeal.
Boxing Rematch with Logan Paul
KSI had a rematch boxing match with Logan Paul, significantly increasing his net worth and fame.
Prime Hydration Co-Owner
KSI co-owned Prime Hydration, a successful beverage company.
Diverse Business Ventures
KSI continues to succeed in music, boxing, and business, solidifying his position as a multifaceted influencer.
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Last updated: February 24, 2026