At age ten, he began playing the flute and went on to become one of South Africa's youngest recognized talents. Studying abroad, he learned to develop global sounds into his own improvisational style. In 2008 he released his debut, Colour, a collection of songs inspired by global sounds (Argentina, Ireland, Spain, Africa) and performed on his trademark flute. Songs from that debut (along with a few from his 2010 sophomore follow-up, Two Voices) made their way onto 2012's Half Moon collection. In 2010 his show ‘Kellerman Colour Live’ won the 2010 SAMA for ‘Best Jazz/Instrumental/Popular Classical DVD’. He followed his performance at the FIFA Soccer World Cup Closing Ceremony with concerts at the Standard Bank Joy of Jazz festival in Johannesburg and two performances at the Shanghai World Expo in China.
Passionate about teaching and empowering young people, Kellerman has sponsored the living expenses of ten children in the SOS Children’s Village in Ennerdale, South Africa for the past 14 years; he has also financed the building of a house in the SOS Children’s Village in Rustenburg, South Africa. For his continued efforts in helping give these children a better life, Kellerman was nominated by the SOS Children’s Villages for the Inyathelo Special Recognition Award for Philanthropy. He continues to also facilitate the teaching of young dance and music students in his country.
Some new songs were included on 2012's Timeless, most notably a pair of tracks dedicated to Nelson Mandela and a sparse cover of the Game of Thrones theme song. Mzansi, his 2013 release, included only two songs that didn't already appear on Two Voices. Together, these five releases established Kellerman as a popular world/roots musician, but it was not until Samsara that his international recognition increased. He followed that success with Love Language in 2015.
- Best Creative Album of the Year
- Best Male Artist & Composer / Co-composer
- Songwriter of the year