St. John is an assistant for the Quincy University men's and women's tennis teams. He was born and raised on the Caribbean island of Greneda, where he trained at the Glynik School of Tennis. St. John trained under Glynn James, a former NCAA tennis player and member of the Eastern Caribbean David Cup Team.
St. John attended Barry University for his undergraduate studies then received his masters degree at Nova Southeastern University in Fort Lauderdale, Florida. St. John has served as an assistant coach at Scott County High School in Kentucky. In 2015, St. John served as the head coach for men's and women's tennis ar Berea College before coming to QU in the fall of 2017. He now serves as assistant tennis coach as well as Director of Campus Programs and Residence Life.Â