Yaggan Mafirika Magane Joseph Leeuw is a South African medical doctor specializing in HIV/AIDS and tropical medicine. He has over 30 years of experience working in both public and private sectors in South Africa, the UK, Zambia, and Tanzania. His experience includes clinical research, managing HIV/AIDS clinics, training healthcare workers, and advising the South African government on HIV/AIDS policy and programs. He currently works as a training consultant, facilitating professional development courses on topics related to HIV/AIDS management.