Since John assumed the head coaching position of the boys' squad in 2003, the team has earned nine top three finishes in the New England championship meet and won the championship in 2009, 2010, 2013, and 2015. He has also coached soccer and water polo at the Academy. Before coming to Deerfield, John taught at Western Reserve Academy in Hudson, OH where he coached soccer and served as head coach of the boys swim team; he also taught at Kent State University, Case Western Reserve University, and the University of Illinois at Chicago.
As an athlete in his own right, John played soccer, water polo, and swam in high school in which earned All-America honors as a member of his high school team.
He writes: "The boys swimming program at Deerfield enjoys a unique and storied tradition. In conjunction with the Academy’s mission to nurture the mind, body, and spirit, team members strive to realize and perpetuate the promise of that tradition in all areas of school life."