Unsurprisingly, Professor Dr. Harith obtained a first-class degree in physics during his undergraduate studies at the University of Malaya. He continued his studies with a master's degree in high voltage technology and a doctorate in laser technology from the University of Wales in the United Kingdom.
In 1983, he began his academic career as a lecturer at the University of Malaya and currently holds the position of Professor of Photonics. Apart from academia, Professor Dr. Harith has held several notable appointments and positions. These include Programme Head for the National Top-Down Project on Photonics at MOSTI since 1999, Programme Head for the Optical Planar Waveguides Project since 2001, Senior Principal Analyst at the Malaysian Industry-Government Group for High Technology (MIGHT) in the Prime Minister's Department since 2001, and Reviewer for IEEE Photonics Technology Letters in the US. He is also a Fellow of the Academy of Sciences, Malaysia.