Ong’s research centers around implantable sensors, wireless sensors, electronic devices, and magneto-elastic materials. He was involved in the development and implementation of a number of wireless sensor technologies including magneto-elastic resonant sensors and inductive-capacitive resonant circuit sensors for biomedical applications. Currently, Ong focuses on the development of “smart implants”, which are based on wireless sensor/actuator platforms that not only can monitor physiological conditions in real time, but also react and adapt to changes for improving treatment outcomes.