Baseball began for John in Seymour, CT. A lifetime of accomplishments began back in 2007 when John led the Seymour Wildcats of his hometown Seymour, CT to their 2007 State Championship. For the following two years he was consecutively an All League and All State Selection. 

John continued his career playing for Nick Giaquinto as a Sacred Heart University Pioneer. He was a two year team captain, 2 time All – NEC player, 2011 NEC Tournament MVP, and two year NEC champion with NCAA regional trips to Clemson and NC State. He leaves behind in the Sacred Heart University record books, the most triples in a season (8) & career (17), most career RBI (170), most career total bases (379), second in career hits (264) & fourth in a season (76), third in career stolen bases (66), third in career ABs (774), fourth in career runs scored (135), and seventh in career doubles (45). 

In his summers off from the Pioneers, he played in various summer leagues. The first year for the Rome Thunderbolts of the NYCBL (2010),  second year, for the Mystic Schooners of the NECBL (2011), and lastly, for the Bourne Braves of the Cape Cod Baseball League (2012). He earned the status of making the All Star team in all 3 leagues.

In 2013, following his career at Sacred Heart, John Murphy was a 6th round draft pick (194th overall) by the New York Yankees. He was the highest baseball draft pick in SHU’s history. After 2 years in the minor leagues, playing for the Staten Island Yankees and the Charleston Riverdogs, John left his role as a player and began his career as a coach.

Under the guidance of Mike Gambino he spent 2 years as Volunteer Assistant at Boston College. In his first season there, the team earned the title of 2016 NCAA Oxford Regional Champions and a Super Regional Team in Miami, FL.

Following his second season at Boston College, John accepted the hitting coach position for the Black Knights of Army West Point under Jim Foster. In the 2018 season, the Black Knights won the Patriot League for the first time since 2013 with an overall record of 37-24 and 18-7 record in Patriot League play. The team also received a berth in the NC State Regional. 

In 2019, John returned to Boston College but this time as their hitting coach and assisting with infield development. In his first two seasons, offensive player accolades include Sal Frelick 2nd team All – ACC & All Freshman ACC, Cody Morissette 2nd team All – ACC & All Freshman ACC, Jake Alu 3rd team All-ACC &  24th Round pick to Washington Nationals, while the Eagles were tied for 4th in offense in the ACC. In the shortened 2020 season Joe Suozzi signed a free agent contract with the New York Mets. 

In John’s last season with BC, offense achieved a .270 team batting average with (3) 1st team All-ACC selections. Sal Frelick was selected 15th overall in the first round of the 2021 MLB draft to the Milwaukee Brewers, which is the second highest pick in program history. He was also named an All American, Golden Spikes Semifinalist, 1st team All-ACC, and a member of the ABCA All-Northeast First Team. Frelick holds places as 6th in ACC in Batting average (.359), 8th in OBP (.443) 8th in doubles (17), and 10th in hits (70). Cody Morissette was selected 52nd overall in the second round of the 2021 MLB Draft to the Miami Marlins. He became the first 2 time All-American in program history while finishing 14th in ACC in batting average (.321). He was also named to the All-ACC 1st team. Luke Gold (.316) finished 20th in ACC batting average and was a 1st team All-ACC selection. Brian Dempsey, the shortstop for the eagles, was also named to the All-Northeast First Team.