KSI is an acronym that stands for Knowledge, Strength, Integrity. It is also the stage name of Olajide Olayinka Williams Olatunji, a British Internet personality, professional boxer, and musician. KSI registered his first account on YouTube under the username "JideJunior" in 2008 while in his early teens. He registered his current YouTube account on 24 July 2009 under the name KSI Olajide BT, where he uploaded gaming-commentary videos of the FIFA video game series from his bedroom at his parents house in Watford. KSI is the CEO of Misfits Boxing and the co-owner of Prime Hydration, XIX Vodka, Sidemen Clothing, and a restaurant chain known as Sides. He has a reported net worth of $23.9 million.