Moosa grew up in Grassy Park and has three siblings. He attended South Peninsula High School until 1994. His sister is a doctor, his Indian-born father is an orthopaedic surgeon, his Cape Town-born Malay mother is a GP. Since he was a child, he wanted to do medicine.
Moosa spent three years training in magic and became a silver medallion graduate of the College of Magic in Cape Town. He started his comedy career as a comedy magician and he was presented with the Comedy Magic award at the Center for the Magical Arts in Cape Town. His future in magic was terminated when somebody doing flash photography illuminated the wire across the stage where his magic orb was floating.
Moosa then spent six years training in medicine at University of Cape Town Medical School and did his internship in hospitals near Thokoza in Gauteng, at Groote Schuur and Khayelitsha in Cape Town. In 2001, he graduated from UCT Medical School. He is a qualified medical doctor and GP. He then worked for three years as a doctor.