University Southern California Trojans
USC Baseball Hires Bill Mosiello as Assistant Coach
July 24, 2026 | Baseball
LOS ANGELES – USC Baseball Head Coach Andy Stankiewicz announced the hiring of Bill Mosiello as assistant coach with the Trojans on Friday (July 24).
Mosiello, a 36-year veteran of both the collegiate and professional levels, will serve as the Trojans' hitting coach, overseeing the team's offensive strategy while also coaching the catchers.
"We are very excited to name Bill Mosiello as an assistant coach with our program," said Stankiewicz. "Coach Mosiello's resume is as good as any in the country. He has shined in every aspect of player development, in both professional baseball and college, and he has one of the finest baseball minds in the game. We welcome Coach Mosiello and look forward to his impact on USC baseball."
Mosiello's resume includes a recent stint as the head coach at Ohio State, 11 years at TCU where he was the associate head coach, and seven years in minor league baseball with the Yankees and Angels organizations. Mosiello is also no stranger to USC and Coach Stankiewics, as he spent the 2007 season as an assistant at Troy, and was an assistant alongside Stankiewicz on the 2025 USA Baseball Collegiate National Team.
"I'm incredibly blessed and honored to be a part of the Trojan Family and look forward to helping to add to the legacy of one of the most storied programs in all of college baseball," said Mosiello. "As a Southern California native, who began my career just down the road, coaching the Trojans is a dream come true. To do it under the leadership of Andy Stankiewicz makes the opportunity even more special. I am very excited to get to work."
In two seasons at Ohio State, Mosiello led the Buckeyes to a 60-51 overall record and a 21-27 Big Ten mark. Mosiello's tenure was highlighted by a trip to the Big Ten Tournament in 2024. It was Ohio State's first appearance in the conference tournament since 2019.
Mosiello returned to TCU in 2025 after also working with the Horned Frogs from 2014-22. During his tenure, TCU made four consecutive appearances in the College World Series (2014-17), advanced to eight NCAA Tournaments, won four Big 12 regular season titles and three Big 12 tournament crowns. TCU put together a 427-206 (.674) record in his time on campus.
Prior to TCU, Mosiello spent two seasons at Tennessee, serving as the recruiting coordinator and hitting instructor. He helped the Volunteers secure two Top 20 recruiting classes and had 11 players drafted during his time in Knoxville.
From 2009-2011, Mosiello served as a manager in the Los Angeles Angels organization, coaching the team's Double-A affiliate, the Arkansas Travelers during that time, where he tutored MLB phenom Mike Trout for nearly two full seasons. Mosiello joined the Angels organization in 2009 as manager of the single-A Cedar Rapids Kernels. He guided them to a 160-116 record (.580) during the 2009 and 2010 campaigns. Mosiello owns a career managerial record of 383-294 (.566) in the minor leagues, including his two years at Cedar Rapids and parts of three seasons in the New York Yankees organization from 2004-06.
Mosiello spent four years with the New York Yankees organization, including two as the manager for the Charleston RiverDogs, the Yankees' single-A affiliate of the South Atlantic League, where he posted a two-year record of 129-98 (.568). He also managed the Battle Creek Yankees in 2004 and spent a season as the hitting instructor for the Trenton Thunder (AA).
Between his stints with the Yankees and Angels, Mosiello returned to the collegiate ranks as a hitting coach at USC in 2007 and at Auburn in 2008. Before beginning his minor league career, Mosiello spent 15 seasons in the collegiate coaching ranks. After the completion of his playing career at Fresno State in 1986, he began his coaching career at Cerritos College where he posted a 163-34 record in four seasons (1987-90), won four South Coast Conference titles and two California state junior college championships.
Mosiello made the move to the Division I level in 1991, joining Augie Garrido's staff at Cal State Fullerton where he spent two seasons (1991-92). In `92, the Titans advanced to the College World Series championship game, featuring Golden Spikes Award winner and No. 1 overall draft selection Phil Nevin.
His resume also includes stops at Tennessee (1993-94), Ole Miss (1995), Oklahoma (1996-2000) and Arizona State (2001).
Mosiello has earned Manager of the Year honors twice in the Alaska Summer League (1990, 1991) and once in the Cape Cod Baseball League (1998). Twice, he has been a coach at the national level, serving on USA Baseball's 2017 18U staff and the 2025 Collegiate National Team. He also served as the 2018 16U NTDP head coach.
A 1982 graduate of Cerritos High School, Mosiello was a catcher during his collegiate career. He transferred to Cerritos College after a redshirt year at Fresno State, helping Cerritos to the 1985 state championship before returning to Fresno State in 1986. There he earned the Pacific Coast Athletic Association's Scholar-Athlete Award and was named the team's Most Inspirational Player.
COACHING EXPERIENCE
TCU (2014-22, 2025-26) – Associate Head Coach
Ohio State (2023-24) – Head Coach
Tennessee (2012-14) – Assistant Coach
Arkansas Travelers/Cedar Rapids Kernels (2009-11) – Manager
Auburn (2008-09) – Assistant Coach
USC (2007-08) – Assistant Coach
Charleston RiverDogs (2005-06) – Manager
Battle Creek Yankees (2004) – Manager
Trenton Thunder (2003) – Hitting Instructor
Arizona State (2001-02) – Assistant Coach
Oklahoma (1996-2001) – Assistant Coach
Ole Miss (1994-95) – Assistant Coach
Tennessee (1993-94) – Assistant Coach
Cal State Fullerton (1991-92) – Assistant Coach
Cerritos College (1987-90) – Head Coach
Mosiello, a 36-year veteran of both the collegiate and professional levels, will serve as the Trojans' hitting coach, overseeing the team's offensive strategy while also coaching the catchers.
"We are very excited to name Bill Mosiello as an assistant coach with our program," said Stankiewicz. "Coach Mosiello's resume is as good as any in the country. He has shined in every aspect of player development, in both professional baseball and college, and he has one of the finest baseball minds in the game. We welcome Coach Mosiello and look forward to his impact on USC baseball."
Mosiello's resume includes a recent stint as the head coach at Ohio State, 11 years at TCU where he was the associate head coach, and seven years in minor league baseball with the Yankees and Angels organizations. Mosiello is also no stranger to USC and Coach Stankiewics, as he spent the 2007 season as an assistant at Troy, and was an assistant alongside Stankiewicz on the 2025 USA Baseball Collegiate National Team.
"I'm incredibly blessed and honored to be a part of the Trojan Family and look forward to helping to add to the legacy of one of the most storied programs in all of college baseball," said Mosiello. "As a Southern California native, who began my career just down the road, coaching the Trojans is a dream come true. To do it under the leadership of Andy Stankiewicz makes the opportunity even more special. I am very excited to get to work."
In two seasons at Ohio State, Mosiello led the Buckeyes to a 60-51 overall record and a 21-27 Big Ten mark. Mosiello's tenure was highlighted by a trip to the Big Ten Tournament in 2024. It was Ohio State's first appearance in the conference tournament since 2019.
Mosiello returned to TCU in 2025 after also working with the Horned Frogs from 2014-22. During his tenure, TCU made four consecutive appearances in the College World Series (2014-17), advanced to eight NCAA Tournaments, won four Big 12 regular season titles and three Big 12 tournament crowns. TCU put together a 427-206 (.674) record in his time on campus.
Prior to TCU, Mosiello spent two seasons at Tennessee, serving as the recruiting coordinator and hitting instructor. He helped the Volunteers secure two Top 20 recruiting classes and had 11 players drafted during his time in Knoxville.
From 2009-2011, Mosiello served as a manager in the Los Angeles Angels organization, coaching the team's Double-A affiliate, the Arkansas Travelers during that time, where he tutored MLB phenom Mike Trout for nearly two full seasons. Mosiello joined the Angels organization in 2009 as manager of the single-A Cedar Rapids Kernels. He guided them to a 160-116 record (.580) during the 2009 and 2010 campaigns. Mosiello owns a career managerial record of 383-294 (.566) in the minor leagues, including his two years at Cedar Rapids and parts of three seasons in the New York Yankees organization from 2004-06.
Mosiello spent four years with the New York Yankees organization, including two as the manager for the Charleston RiverDogs, the Yankees' single-A affiliate of the South Atlantic League, where he posted a two-year record of 129-98 (.568). He also managed the Battle Creek Yankees in 2004 and spent a season as the hitting instructor for the Trenton Thunder (AA).
Between his stints with the Yankees and Angels, Mosiello returned to the collegiate ranks as a hitting coach at USC in 2007 and at Auburn in 2008. Before beginning his minor league career, Mosiello spent 15 seasons in the collegiate coaching ranks. After the completion of his playing career at Fresno State in 1986, he began his coaching career at Cerritos College where he posted a 163-34 record in four seasons (1987-90), won four South Coast Conference titles and two California state junior college championships.
Mosiello made the move to the Division I level in 1991, joining Augie Garrido's staff at Cal State Fullerton where he spent two seasons (1991-92). In `92, the Titans advanced to the College World Series championship game, featuring Golden Spikes Award winner and No. 1 overall draft selection Phil Nevin.
His resume also includes stops at Tennessee (1993-94), Ole Miss (1995), Oklahoma (1996-2000) and Arizona State (2001).
Mosiello has earned Manager of the Year honors twice in the Alaska Summer League (1990, 1991) and once in the Cape Cod Baseball League (1998). Twice, he has been a coach at the national level, serving on USA Baseball's 2017 18U staff and the 2025 Collegiate National Team. He also served as the 2018 16U NTDP head coach.
A 1982 graduate of Cerritos High School, Mosiello was a catcher during his collegiate career. He transferred to Cerritos College after a redshirt year at Fresno State, helping Cerritos to the 1985 state championship before returning to Fresno State in 1986. There he earned the Pacific Coast Athletic Association's Scholar-Athlete Award and was named the team's Most Inspirational Player.
COACHING EXPERIENCE
TCU (2014-22, 2025-26) – Associate Head Coach
Ohio State (2023-24) – Head Coach
Tennessee (2012-14) – Assistant Coach
Arkansas Travelers/Cedar Rapids Kernels (2009-11) – Manager
Auburn (2008-09) – Assistant Coach
USC (2007-08) – Assistant Coach
Charleston RiverDogs (2005-06) – Manager
Battle Creek Yankees (2004) – Manager
Trenton Thunder (2003) – Hitting Instructor
Arizona State (2001-02) – Assistant Coach
Oklahoma (1996-2001) – Assistant Coach
Ole Miss (1994-95) – Assistant Coach
Tennessee (1993-94) – Assistant Coach
Cal State Fullerton (1991-92) – Assistant Coach
Cerritos College (1987-90) – Head Coach
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