Zaini Bin Ujang is a professional environmental engineer-cum scientist, especially concerning river rehabilitation and environmental sustainability in developing countries. His interest in the field leads him to collaborate with leading scholars worldwide, particularly in membrane bioreactor, granulation process, and membrane biofouling control. He is a Fellow of various professional bodies and a Visiting Professor at the Imperial College London (UK), Lund (Sweden), and Tsukuba (Japan). He received the Honorary Doctor of Science from Newcastle University (UK) (2018) and was also Vice-Chancellor of Universiti Teknologi Malaysia from 2008 to 2013 and later became the Secretary-General of three ministers from 2013 to 2018. He has also registered more than 20 intellectual property rights and published more than 300 technical papers and 40 books.