Olajide William 'JJ' Olatunji, known to fans as KSI, is one of YouTube's biggest stars as well as a chart-topping musician and a professional boxer. KSI - which stands for Knowledge, Strength, and Integrity - will stop by BUILD to talk about how he built his brand and social media following of over 39 million. Free to RSVP. Afternoon With KSI RSVP
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