Predrag Marjanovie was born on I May, 1951 in Belgrade, Yugoslavia, where he lived until November 1992. He moved with his wife Mara and daughter Nevena to Glasgow, Scotland, where he continued to reside throughout his time in the UK. I was supervisor of his Ph.D. programme and colleague in Glasgow for about 5 years. Predrag's involvement in research covered a diverse range of topics, including hydraulic transport, fluid mechanics, bulk material characterisation and hopper design. This review will mostly feature the work undertaken for his Ph.D. and that associated with pneumatic conveying. A definitive list of Predrag's references, however, is appended. Predrag died suddenly on 14 September, 2001. (C) 2004 Elsevier B.V. All rights reserved.