Tereschuk in 2011 took his place as the only head coach in Chapman's storied baseball history with 300 career victories. Additionally, he guided the Panthers to yet another West Region championship and second place finish at the Division III championships - the Panthers' third top-three finish in 10 years. His .734 career winning percentage is among the best in all of Division III.

Tereschuk came storming onto the Division III scene in 2003 when, as a rookie head coach, he guided Chapman to its first national championship in 35 years. Since then, Tereschuk's 'pitching and defense' philosophy has gotten earned Panthers seven West Region titles in 10 years (2003, '05-'09 and '11) and Chapman has reached the postseason nine times. He has earned West Region Coach of the Year six times, as well as ABCA Division III National Coach of the Year in 2003. He has coached 16 All-Americans and 34 All-West Region players and has seen seven of his players drafted by Major League organizations.

Before earning the top spot at Chapman, Tereschuk served as head coach at nearby Villa Park High School, winning two CIF Southern Section championships. He was honored as CIF-SS Coach of the Year in 2000 and 2002, and led the team to the CIF playoffs in all four of his years. Tereschuk played baseball at Long Beach City College and attended the University of San Diego on a baseball scholarship from 1978-82. He received bachelor's degrees in history and political science from Cal State Long Beach in 1984 and 1987, respectively. He then earned a master's degree in education from Whittier College in 1993.