Reese was born in Boulder, Colorado in 1985. He was raised by his single mother, who taught him how to garden from a young age. He was raised to be kind and gentle, albeit a little shy.
He went to college in Olympia, Washington at Evergreen State University, where he wrote a thesis on increasing carbon emissions, and graduated in 2007. His mother died the fall after his graduation due a strange infection. He went on to teach at Evergreen for several years. Reese would occasionally go on school-funded trips around the world to collect samples. In 2017, Galloway joined a UN initiative which flew him to a small country bordering Russia, named Chernarus. Galloway's mission was to help re-establish the local farms in Chernarus, as the country's crop production was abysmal. It was during Reese's trip that the events near Severograd and the infection begun.