Prof. J. A. du Plessis has more than 30 years of experience in the field of water engineering, working for 5 years for the Department of Water and Sanitation and the Department of Agricultural with irrigation boards and government water schemes.

He worked for 5 years with the City of Cape Town, dealing with storm water and managing their hydrology database. He then joined the West Coast District Municipality for a period of 7 years as the Director: Water Supply, where he gained experience with all the institutional arrangements and specifically the Water Act and Water Service Act. He joins the University of Stellenbosch in 2003 and is presently a Professor in Hydrology in the Civil Engineering Department. He specialized in water resource evaluations, flood hydrology and he provides institution support to various local authorities.

Kobus serves as a member of the Executive committee in the Board of the Institute of Municipal Engineers for Southern Africa where he is responsible (Director) for training and skills development. He also serves on the Education and Training committee of South African Institute of Civil Engineers (SAICE) and serves on the Editorial Panel of the SAICE Journal. He is a former Head of the Department of Civil Engineering at the University of Stellenbosch and also serves as Technical Advisor for the International conference on Water, Environment and Energy in 2016 and 2018.