Witold works as an associate professor at the University of Limerick in the chemical sciences department. He is also course director of the IChemE-accredited chemical and biochemical engineering (HonsBEng) programme.

Witold is co-leader of the ‘Carbolea’ research group on biomass/biowaste thermochemical conversions at UL. Carbolea is a leading research group on advanced biowaste strategies and technologies in Ireland and Europe. Work in his laboratory concentrates on pyrolysis, gasification, hydrothermal processing of bio-waste, product upgrading and catalytic conversion.

He has successfully supervised 13 PhD students. Currently (2021) he supervises 3 PhD students as main supervisor and 6 as co-supervisor. In Ireland he has participated in four EU projects and five national, publicly-funded projects. He is author of over ninety papers in ISI journals (h-index = 28), and more than 100 communications in international conferences.

He is an external EU expert in the area of biomass thermal conversion.

Witold graduated from Lodz Technical University and in his career worked in Germany and the UK. He also acted as a visiting lecturer at Cambridge University (UK); Aalto University (Finland); American University of Beirut (Lebanon); Belarusian State Technological University; and National Technical University of Ukraine. He is an editorial board member and occasional guest editor of three ISI journals.