Dra. Muller is the head of the transplantation service at Groote Schuur Hospital.
Her research is in HIV positive transplantation: the “HIV positive to positive” transplant programme she started at in 2008 changed the life of many socioeconomically disadvantaged people. Currently she is president of the South African Transplantation Society and councillor for Middle East/Africa for the international Transplantation Society (TTS).