Pierre Y. Julien is Professor of Civil and Environmental Engineering at Colorado State University. He has 35 years of professional engineering experience in the fields of hydraulics and river sedimentation. Dr Julien has authored more than 500 scientific contributions including two textbooks (the first edition of River Mechanics (Cambridge, 2002), and Erosion and Sedimentation (second edition, Cambridge, 2010), 25 book chapters and manuals, 185 refereed journal articles, and 230 professional presentations and conference papers. He has delivered 20 keynote addresses and guided more than 130 graduate students to completion of their engineering degrees. He is the recipient of the Hans Albert Einstein Award of the American Society of Civil Engineers (ASCE), delivered the Hunter Rouse Lecture of the Environmental and Water Resources Institute (ASCE) in 2015, and is a former editor for the ASCE Journal of Hydraulic Engineering.