Marshall is Mercersburg’s director of library services, and an assistant coach of women’s soccer and wrestling. He came to Mercersburg from the Pingry School in Martinsville, New Jersey, where he coached the varsity water polo and wrestling teams. He also served as a substitute teacher for Emily Charter School in Trenton and was an intern at the Lawrenceville School. Marshall has worked as a content creation specialist, maintaining news pages on factiva.com for Dow Jones and Reuters.