Chak-sing is known as a pioneer for establishing and advancing rheumatology in Hong Kong, Asia and beyond. Chak-sing is Chair and Daniel CK Yu Professor in Rheumatology and Clinical Immunology at the University of Hong Kong and was the Chairperson at the School of Clinical Medicine’s Department of Medicine at the University of Hong Kong, the Chief of Service at Queen Mary Hospital’s Department of Medicine, and the President at the Hong Kong Academy of Medicine.