W. Stanley Hall was eighteen years old when he was recruited to work as a machinist on the cyclotron, first at Princeton University and later at the Los Alamos Laboratory. He worked at Los Alamos as a civilian, then later was drafted and worked as part of the Special Engineer Detachment (SED). In this interview, he describes both his work and recreational experiences during the Manhattan Project. He witnessed the Trinity Test from a location ten miles away. Hall describes hearing “The Star Spangled Banner” play over the radio at the moment of the Trinity Test and the color and the noise of the explosion. Hall also talks about taking advantage of the hiking, fishing, and horseback riding opportunities around him, including some trouble he encountered walking Kitty Oppenheimer’s horse. He provides an overview of his forty-year-long career at Los Alamos National Laboratory, where he worked for the computing group.