Despite the disapproval of his Muslim parents and the white ("European") community, Mosaval accepted her invitation and began his dance training at the ballet school in 1947.
"[6][Note 1] In the classes of Jasmine Honoré, Mosaval advanced quickly, as his strong, flexible physique and iron determination to succeed reinforced his natural facility for classical ballet technique.
[citation needed] Apartheid prevented Mosaval from pursuing a dance career in his home country, but in 1950 he was noticed by visiting ballet celebrities Alicia Markova and Anton Dolin, after he was smuggled into Cape Town's Alhambra Theatre for an audition.
Mosaval toured extensively with the Royal Ballet, dancing in continental Europe, Australia, New Zealand, the Middle East, the Far East, Canada, and the United States as partner to such famous ballerinas as Margot Fonteyn, Svetlana Beriosova, Elaine Fifield, Lynn Seymour, Merle Park, Doreen Wells and fellow South African Nadia Nerina in ballets choreographed by Frederick Ashton, Kenneth MacMillan, Ninette de Valois, and two South Africans, David Poole and John Cranko.
"[8] After twenty-five years with the Royal Ballet, Mosaval retired from performing and returned to Cape Town, settling there permanently in 1976.
He did make a guest appearance with CAPAB Ballet in the title role of Michel Fokine's Petruskha, thus becoming the first black dancer to perform on the stage of the Nico Malan Opera House.
Following the principles of his mentor, Dulcie Howes, Mosaval wanted to share his knowledge and love of ballet with students of all races, so he continued to find ways to dance and to teach.
In 1977, Mosaval received a Queen Elizabeth II Silver Jubilee Medal for his services to ballet in the United Kingdom.
For his contribution to the performing arts, and to uplifting young dancers through his teaching, the City of Cape Town then awarded Mosaval its Civic Honours.