Dr. David Biedenharn is a river mechanics, subject matter expert, with the Corps of Engineer's Coastal and Hydraulic Laboratory.  He is a professional engineer with over forty years of experience in hydraulics, river engineering, sedimentation, channel restoration, and fluvial geomorphology.  Dr. Biedenharn also teaches in the Tulane Department of Science and Engineering, where he helped develop their River Science and Engineering Program. But the main reason we invited David to be the first guest on the podcast, is that he is responsible for mentoring a generation (and, by now, more than one generation) of River Scientists and Engineers in the Corps of Engineers.    From the first time I met him in my early 20's, conversations with David have formed the way I think about river processes and our engineering interventions in river systems at every scale.  We talked about his experiences mentoring new river scientists and engineers, the lessons the Corps learned from the "demonstration project," the appropriate place of rock and vegetation in restoration design, and balancing the "E's" of human intervention in river systems. We are building a podcast website with bonus materials and resources, which we will link to here shortly.