Born in Annotto Bay, Jamaica, Ballentine moved to Kingston at the age of 12. He launched his deejay career with the Black Culture Sound System at age 14 as “Double Ugly”. In 1980, he joined the Killamanjaro sound system, there got the chance to learn from established deejays Super Cat and Early B, and released his debut single as “Uglyman”. Yet another name change made him the now well known Ninjaman. In 1987, Ninjaman recorded – and produced himself – his first hit single “Protection”, a duet with Courtney Melody. The following years brought many prolific collaborations with producers like King Jammy, Lloyd Pickout Dennis, Witty, Xterminator, Philip “Fatis” Burrell, Redman, Ini Kamoze, Bobby Digital, Augustus “Gussie” Clarke, and Steely & Clevie and Henry “Junjo” Lawes. It has been said that Ninjaman comes up with all of his lyrics on the spot in the recording studio, in a freestyle manner.
His hits over the years 1989-1992, like “Murder Dem”, “Permit to Bury” and “Above the Law” reinforced Ninjaman’s image of a violent rude boy. One of his most infamous rivalries (besides the ongoing quarrels with Flourgon and Super Cat) was the one with Shabba Ranks, leading to a number of clashes.
In 1993, criticism of Ninjaman’s violent and pro-gun lyrics arose, leading to a decline in performing gigs and chances to record.
By 1997, Ninjaman had changed his name once again, now performing gospel reggae songs as “Brother Desmond”. He sought help to fight his crack cocaine addiction and born again Christianity.
In March 2009, Ninjaman, along with his son Janiel, was arrested and charged in connection with a murder of Ricardo Johnson on Marl Road, Kingston, Jamaica. He was granted bail for the sum of JD$2,000,000 in March 2012, and was scheduled to appear in court 15 July 2012.At least 58 jurors were needed for the start of the trial but only 15 showed up. The trial was rescheduled to start in April 2015, but was again postponed and rescheduled to start in January 2016.
In 2015 he parted ways with Downsound Records and opened his own Picture Frame Studio on Blackwood Terrace in Kingston.
On November 20, 2017, Ninjaman and his co-accused were found guilty of the 2009 murder of Ricardo Johnson. On December 18, 2017, Ballentine was sentenced to life in prison, with the possibility of parole after 25 years.