Morné graduated with a BMus in Performance cum laude from the University of Pretoria in 2001. In 2009 he received a Performer's Licentiate in clarinet from the University of South Africa. As an orchestral musician Morné has played for the Johannesburg Philharmonic Orchestra since 2000, and is currently the co-principal clarinettist. He also freelances for the Johannesburg Festival Orchestra, amongst others. Morné is actively involved in the South African new music scene, working with established and young composers in promoting newly-composed local clarinet music.
As an educator Morné has worked for Kingsmead College in Johannesburg since 2005. His role as educator involves arranging music, directing orchestras, and teaching clarinet, music theory and music history. Morné founded the Joburg Clarinet Band in 2015, with the purpose of providing adult amateur clarinettists of all levels an opportunity to make music. As chamber musician Morné regularly performs at national music festivals such as the Wakkerstroom Festival and Klein Karoo Klassique, as well as various established concert series. In 2018 Morné became an artist for Yamaha South Africa and the international reed and mouthpiece company Vandoren.