The theme of Dr. Jacob H. Masliyah's research and development activities over the past two decades has been the behaviour of 'flowing particles and fluids'. His work has ranged from fundamental research in fluid mechanics to highly applied research related to the extraction of bitumen from the Alberta oil sands. He carried out pioneering studies on fluid flow and heat transfer from particles submerged in flowing fluids. His general correlation for the drag force on axisymmetric particles is now included in the most widely used handbook for chemical engineers. He also carried out extensive studies on heat and mass transfer from flat plates due to impinging air jets using double-exposure and real time holography methods. His work on flow through coiled pipes and ducts is well known internationally. The most unique aspect of Dr. Masliyah's work has been his ability to bring rigorous analysis, based on fundamentals, to bear on his applied research projects. Over the last fifteen years, many of his fundamental and applied research ideas have been inspired by the challenge of improving the efficiency of bitumen extraction from oil sands using the Clark hot water process. He has made major contributions dealing with rotating tumblers, inclined plate settlers, flotation columns, and slurry behaviour. His success in research has brought significant benefits to the oil sands industry, assisting in the understanding of the operation of existing plant equipment and providing definitive methods for the design of new plants. As a consequence, the industry's capability to develop and evaluate new oil sands extraction schemes has been dramatically improved. He has published about 120 refereed journal articles and a book on 'Electrokinetic Transport Phenomena'. He is presently working on another book dealing with 'Transport Phenomena in Fluid-Solid' systems.