Helmut Kroiss is an expert in design and operation of municipal and industrial wastewater treatment plants and interdisciplinary river basin management. For over 25 years he was a Professor at the Institute for Water Quality, Resource and Waste Management at the Vienna University of Technology and Dean of the Faculty of Civil Engineering.

Helmut Kroiss has consulted on many national and international projects regarding industrial and municipal wastewater treatment plant design and operation, as well as for regional water quality management projects in Austria, Germany, Singapore, Indonesia, India, China, Hong Kong, Finland, Croatia, Slovenia and Hungary.

As a member of the International Water Quality Association (IWQA) since 1974, Helmut Kroiss served on IWA leadership as Chairman of the Programme Committee and on the Board of Directors. He was also Chairman of the IWA Publishing Committee and former Editor-in-Chief of Water Science and Technology, Water Science and Technology: Water Supply and Water Practice and Technology. For 8 years, he was Chairman of the Large Waste Treatment Plant Specialist Group.