KSI

KSI, born Olajide Olayinka Williams Olatunji on June 19, 1993, in London, is a British-Nigerian YouTuber, musician, boxer, and entrepreneur. He began his rise to fame through YouTube in 2009, posting FIFA gameplay videos under the name youtube.com/KSI, and later became a founding member of the popular creator group Sidemen. Expanding beyond YouTube, KSI launched a successful music career with hit singles and chart-topping albums, including Dissimulation and All Over the Place. In boxing, he gained widespread attention for his matches against Logan Paul and other internet celebrities, earning both victories and his first professional loss in 2023. Off-camera, KSI is a savvy businessman, co-owning brands like Prime Hydration and Sidemen Clothing, while also making appearances in films, documentaries, and TV shows—including becoming a judge on Britain’s Got Talent in 2025. His journey from internet entertainer to global multi-industry figure highlights his adaptability, creativity, and drive.