Jack began as an assistant coach in 1952 at West Pittston High School, under head coach Tom Dean. In 1953, he was appointed as head coach and coached there for five more years. His record at West Pittston was 44-5-0, winning four championships and producing two undefeated united teams. In 1958, he moved to Wilkes-Barre and had a four-year tenure there, where his overall record was 34-5-1, producing three consecutive championships in 1959, 1960, and 1961, losing only one game in that span, and leaving a team that went undefeated in 1962. Moving to Temple University in March of 1962 as backfield coach and offensive coordinator, he remained at Temple University for six seasons. His offense became the number one offensive team in the MAC University Division for three consecutive years and recorded thirty-two new stadium and university records. In 1968, Jack moved to Dallas High School, where his overall record was 63-48-2. His teams won three consecutive championships in 1971, 1972, and 1973. The 1972 team was also undefeated/untied. Overall, in twenty years as a head coach—record is 141-58-3 (69.8% win average), 10 championships (50% of teams coached), 5 undefeated/untied (25% of teams coached). Awarded Coach of the Year by the Times-Leader, Sunday Independent, and WARM radio. Also received an Appreciation Award by the Sunday Independent, received Dapper Dan Coaching Award, and Knights of St. George Sports Achievement Award. Jack was taken into Pennsylvania Scholastic Coaches Hall of Fame in 1987 and into Wyoming Seminary Hall of Fame in 1989.