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Expert has been engaged in studying the creation, transport and dispersal of loose materials on Earth’s surface for more than 30 years and has published extensively in peer-reviewed journals on the topics of sediment transport, assemblages and attributes. He has expertise in modeling the transport and dispersal of sediment and bio-limiting nutrients in steepland rivers; linking marine sediment dispersal with fluxes of sediment off the land; and in assessing the effects of past and future climate change on patterns of erosion and sediment transport in watershed and coastal systems. Expert holds a D.Sc. and Ph.D. from the University of Southampton, U.K. He has held positions at the Universities of Uppsala, Sweden (Research Fellow); Oxford, U.K. (Lecturer, Jesus and St Catherine’s Colleges); Indiana State University (Full Professor); and is an Adjunct Professor at the University Hawai'i, Mānoa, where he teaches geomorphology. Expert has worked on and led research projects in Cyprus, Iceland, Kenya, New Zealand and Switzerland, as well as the United Kingdom and United States, and has most recently applied his expertise to government and local organizations in New Zealand’s East Cape region, parts of which have been described as “examples of the worst pastoral erosion in the world”.

Expert was engaged by Gisborne District Council to compute the bed load yield of the Waipaoa River. Expert was engaged by Gisborne District Council to assess the effects that 21st Century climate change may have on the sediment discharge of the Waipaoa River.