Dr Ling is the Director of Infection Control at Singapore General Hospital. A clinical microbiologist by training, Dr Ling has been active in Infection Control work in Singapore and the region. She has been conducting training programs in infection control in China, South East Asia as well locally in Singapore since 1995.

She is also the Adjunct Assistant Professor at the Duke-NUS Graduate Medical School, where she contributed to the training in microbiology. Her other interests are in quality improvement and research in antimicrobial resistance.