As a practising psychologist in Singapore and Australia, Pek Ru had clinical experience working with adults with psychosis; children and adolescents with mental health and neurodevelopmental disorders. Between 2009 and 2012, Pek Ru was a research fellow at Curtin University working on an Indigenous mental health project, examining cultural influence on the diagnosis of ADHD. She was also a team investigator on the National Health and Medical Research Counsel Capacity Building Grant (Australia) during that period. Beside research and clinical experience, Pek Ru had supervised psychology undergraduate students for research projects. She had also done peer review for a number of international psychology journals.