Coach Siderewicz began playing lacrosse at the age of 8, and his knowledge for the game has vastly grown since picking up a stick. As a midfielder and Clam Alum, Jon played three years of his high school ball at St. John’s Prep before spending his senior year at New England Prep school powerhouse, Brewster Academy in Wolfeboro, NH. After graduating BA in 2010, Jon then played both Division II and III collegiate lacrosse; attending LeMoyne College his freshman year, before transferring to Endicott College where he finished his career as a defensive midfielder and man-down specialist. Jon also traveled across seas with the Global Players team to coach and play against International teams, competing in Germany’s Berlin Open, and Amsterdam’s Lowlands tournament for Team GP in 2013.
“Coach Sider” started his coaching career as the head JV coach at St. John’s Prep in the spring of 2015, before becoming a Varsity Assistant in the spring of 2017. In the last three seasons, the Eagles have had two MIAA playoff appearances, and one Division 1 North sectional final appearance. Siderewicz works primarily as an offensive coach for the Eagles, and also works with both goalies and face-off men. Coach Sider is now in his third year coaching for the Clams. In the Spring of 2020 Coach Sider will be the Varsity Head coach at Manchester-Essex Regional High School.