The focus of my research is to explain how coastal river systems evolve and respond to our rapidly changing world. I quantify fluvial-coastal processes using a blend of theoretical modeling, remote sensing, laboratory flume experiments, and geologic field techniques. My work is defined by two common threads. First, I seek answers to fundamental questions about the origin and organization of coastal river systems. Second, I investigate how coastal river systems today are responding to human activities and global climate change to tackle challenges in geohazards and sustainability. My work interweaves these fundamental and practical threads in targeted research topics, including 1) river delta evolution, 2) coastal impacts of sea-level rise, and 3) the connection between rivers, oceans, and the shallow subsurface.