Jacob Boss Jr. is an American baseball coach and former player, who is the current head baseball coach of the Michigan State Spartans. He played college baseball at Alma College for head coach Bill Klenk from 1990 to 1993. He then served as the head coach of the Eastern Michigan Eagles in 2008.

Early career

Boss played college baseball at Division III Alma College from 1990–1993. In the mid-1990s, Boss served as a high school and community college baseball coach before accepting an assistant coaching position at Eastern Michigan prior to the 1997 season. He left Eastern Michigan after the 2004 season to serve as an assistant at Michigan from 2005–2007.

Head coaching career

Michigan State Baseball during the 2022 Season

Boss was named the head coach at Eastern Michigan for the 2008 season and spent one year there. Under Boss, the team lost its first 17 games but went 25–17 for the remainder of the season. The Eagles won the Mid-American Conference (MAC) Western Division Title and the MAC tournament, thus qualifying for the NCAA tournament.

Boss in a game at Theunissen Stadium in 2012

On July 1, 2008, Boss was named head baseball coach at Michigan State. During his 14 seasons at Michigan State University, Coach Boss has achieved significant success. He holds a record of 383-332 (.536), making him the winningest coach in program history over a 14-year span. Under his leadership, the MSU baseball team has experienced five of the top 10 winningest seasons in program history. They have also achieved seven 30-win seasons in the last 12 years, won the Big Ten regular-season championship in 2011, and made his first NCAA tournament appearance with Michigan State in 2012.

Head coaching record

Below is a table of Boss's yearly records as an NCAA head baseball coach.

Statistics overview
SeasonTeamOverallConferenceStandingPostseason
Eastern Michigan Eagles (Mid-American Conference) (2008)
2008Eastern Michigan25–3415–8 (West)1stNCAA Regional
Eastern Michigan:25–3415–8
Michigan State Spartans (Big Ten Conference) (2009–present)
2009Michigan State23–3113–115thBig Ten tournament
2010Michigan State34–1911–13T-7th
2011Michigan State36–2115–9T-1stBig Ten tournament
2012Michigan State37–2313–115thNCAA Regional
2013Michigan State33–1712–97th
2014Michigan State31–2611–136thBig Ten tournament
2015Michigan State34–2314–10T-3rdBig Ten tournament
2016Michigan State36–2013–11T-6thBig Ten tournament
2017Michigan State29–2310–149th
2018Michigan State20–3211–128thBig Ten tournament
2019Michigan State20–348–1511th
2020Michigan State9–60–0Season canceled due to COVID-19
2021Michigan State17–2717–2711th
2022Michigan State24–308–1612th
2023Michigan State33–2212–128thBig Ten tournament
2024Michigan State24–2711–13T-9th
2025Michigan State28–2713–1712thBig Ten tournament
2026Michigan State11–215–12
Michigan State:479–429 (.528)197–225 (.467)
Total:504–463 (.521)
National champion Postseason invitational champion Conference regular season champion Conference regular season and conference tournament champion Division regular season champion Division regular season and conference tournament champion Conference tournament champion

Personal life

Boss has a nephew, Ike Irish, who plays in the Baltimore Orioles organization.

See also