Olanrewaju Ogunmefun, better known by his stage name Vector tha Viper, is a Nigerian Hip hop artist. Vector has released two studio albums, his debut album State of Surprise (SOS) and The Second Coming. He is the voice behind the Sprite commercial that has aired on most radio stations across Nigeria since 2009. In anticipation of his second studio album, he released a mix tape titled "Bar Racks". He released his second studio album titled The Second Coming on 12 December 2012.
Lanre was born in Ogun State, the fourth of five children. He schooled in Nigeria attending Command children school, Ijebu Ode Grammar School, Government College Victoria Island & Saint Gregory’s College. He started his journey into hip hop way back to junior high in the year 1994. In St. Gregorys College, he was involved in various social activities in which he was made to perform from the stage. In the year 1999, he formed a duo called "Badder Boiz", and they started writing their own songs and in the same year went on to start performing at showcases as a trio. And with a joined effort they aimed at selling the underground music to the surface.
They recorded their first demo series in 1999, and kept on going by attending talent showcases. Vector was going towards the direction of an emcee as his ability to freestyle was made known to the other members of the group. As a group of three, consisting of Vector, Krystal & Blaze, they were together until 2004 when Krystal left the group due to irreconcilable differences. He then attended the University of Lagos, graduating in 2008 with a bachelor's degree in Philosophy.