A third-generation Chinese-Australian, Kingsley has had a diverse career, spanning power engineering and investment banking from Melbourne to Canada and Asia. In 2006, Kingsley co-founded The People's Solicitors alongside Jeff Shaw QC, the former New South Wales Attorney-General, and later a Supreme Court judge, to represent disadvantaged individuals and the less privileged. He remains an active Honorary President of the Chinese Community Council of Australia. His three-year tenure as the National President of the Asian Australian Lawyers Association was transformative.