Dr. Kodithuwakku has obtained his B.Sc. degree in agriculture with specialization in agricultural economics from the University of Peradeniya in 1990. He obtained his MBA degree (Marketing) and PhD in entrepreneurship from the University of Stirling, UK in 1993 and 1997 respectively. He currently serves as a Professor in the University of Peradeniya.
He founded the MBA programme offered by the University of Peradeniya and he has been the Coordinator of the programme since its inception in 1998, in addition to serving as the Chairman of the Board of Study in Business Administration, PGIA since its inception in 2002. He was also the Director of the Agribusiness Centre, the outreach arm of the Faculty of Agriculture, since its inception until September 2011.
At national level, he has been serving as the Senior Vice President of the Sri Lanka Institute of Management, the premier professional body for Sri Lankan management professionals since 2003 and as a member of Board of Study of the Sri Lanka Institute of Marketing, the premier professional body for Sri Lankan marketing professionals since 2002.