Bob Dover is a professional geologist with degrees from Beloit College and the University of North Carolina. He has 36 years of experience in the environmental consulting industry, specializing in the assessment of environmental impacts for proposed energy and transportation infrastructure projects. His primary geologic interest is the role of geology and topography in influencing human settlement patterns, architecture, and historical events.From 2013 to 2022, he visited and photographed more than 600 walkable bridges throughout the United States, Canada, and Europe, observing the people and documenting how they used each bridge. In doing so, he found that bridges represent a unique intersection of his geologic interest with his other interests in biking, and photography of landscapes and cityscapes. He is a contributor of bridge photos and documentation to the historicbridges.org website. Recently retired, he lives in Columbia, Maryland.