Professor Musk has been a respiratory physician at Sir Charles Gairdner Hospital since 1978, Clinical Professor of Medicine at the University of Western Australia since 1992 and Clinical Professor of the School of Population Health at the University of Western Australia since 1998. He has authored over 200 peer-reviewed articles, numerous reviews and book chapters in the scientific literature. His research focus is the epidemiology of respiratory diseases and cancer, particularly related to Wittenoom blue asbestos workers, Kalgoorlie goldminers and the Busselton population. His academic activities focus on the investigation of causes, prevention and treatment of occupational and environmental lung diseases and his clinical activities focus on the investigation and treatment of occupational lung disease and evaluation of disability.
Professor Musk is also Chairperson of the Busselton Population Research Foundation, Chairperson of WA Mesothelioma Register, Past President of the Australian Council Smoking and Health and a Member of the Pneumoconiosis Medical Panel in WA. In 1992 Dr Musk was awarded Member of the Order of Australia for services to medicine in the area of asbestos-related diseases and smoking control.
Professor Musk has also been a co-investigator on NCARD projects on the Genetic Understanding of Asbestos-Related Disease (GUARD) study with Professor Lyle Palmer and on the Effects of Asbestos Exposure in Aboriginal people from Roebourne and Balyugal study with Professor Richard Murray from James Cook University.