Sarath graduated from the University of Moratuwa, Sri Lanka with a BSc (Eng) specialising in Electrical Power. He obtained his MEngSc from the University of New South Wales and PhD from the University of Wollongong. He has been on the academic staff at the University of Wollongong since 1988. He has been active in electromagnetic modelling, machine design and analysis, in particular permanent magnet machines.
His current research interests are in the general area of power quality and in particular voltage fluctuations, flicker and voltage unbalance. He is a member of the Standards Australia Committee on Power Quality and is/has been closely involved with CIGRÉ C4 (System Technical Performance) working groups at international level. He is currently the Technical Director of the Australian Power Quality and Reliability Centre.