Omar was born and raised in Carolina, Puerto Rico. He is the oldest son of William Landrón and Luz Antonia Rivera. During his youth, he became an active member of a Protestant church, Iglesia Evangélica Restauración en Cristo in Bayamón where he occasionally offered sermons. However, after four years, he left the church to dedicate himself to singing.
His first public performance in a night club was accompanied by disc jockey Eliel Lind Osorio. Afterwards he appeared regularly on compilation albums from popular DJs and producers including Luny Tunes, Noriega, and DJ Eric. He also worked as a backup singer for the duo Héctor & Tito. One of the members, Héctor Delgado, helped him produce his first solo album.
Omar's career rose to stardom with the release of his first studio album, The Last Don. Both the studio version and its live edition have been certified platinum by the Recording Industry Association of America. Worldwide, The Last Don: Live [CD & DVD] has sold over one million copies, according to his official website. He earned awards for Latin Pop Album of the Year and New Artist & Latin Rap/Hip-Hop Album of the Year by the Billboard Latin Music Awards in 2003. The Last Don: Live [CD & DVD] was also nominated for Urban Music Album at the 2005 Latin Grammy Awards.
- Spanish: "The King"
- Biografías, Prpop.org. Retrieved on 2012-01-29.