Garshaw grew up in southern California and Long Island, NY. He received his Bs in Ecology and Anthropology from Stony Brook University and after graduating, he traveled to Madagascar to conduct research on a highly unique crayfish genus. He also worked out of Logan, Utah and Prineville, Oregon conducting stream and rivers surveys for Utah State University and the Bureau of Land Management. During the Master of Development Practice program at UC Berkeley, he focused his work on community based water resources management and stream and river restoration. He worked at a large NGO researching springs near Kathmandu, Nepal and on floodplain management and urban creek restoration projects with American Rivers. Garshaw loves to surf, fish, cook, climb and mountain bike.