2020 Baseball Coaching Staff

Aaron Kroll
Varsity Head Coach

After graduating from Burlington High School in Burlington, Iowa in 1998, Kroll attended Coe College, where he earned his bachelor's degree in education. He also played four years of baseball as a first baseman and pitcher. During college, he also spent time as an assistant coach for two years at Notre Dame High School and one year as the freshmen baseball coach at Cedar Rapids Prairie High School.

Kroll moved to Arizona after college and became the head baseball coach at Parker High School. He also spent two years as an assistant coach with the semi-pro team Havasu Heat. From 2008-2014, he was the head coach at Ben Davis High School, where he led the Giants to a Class 4A Sectional Title in 2014, which was the school’s first since 1996. Kroll and his staff are 107-39 in their first five seasons at Roncalli, highlighted by winning the school’s first baseball state championship in 2016. The Rebels finished 16-10 last season, won the Circle City Conference and the inaugural Circle City Conference Tournament. He is very excited about his sixth year leading the Rebels, and looks forward to building upon Roncalli’s successful baseball tradition.

Kroll lives in Indianapolis with his wife Brooke, his son Griffin, and his daughter Kamryn.


Mark Pieper
Varsity Assistant

Mark Pieper begins his sixth season with Roncalli baseball. He started his career in Perry Township, coaching baseball at Southport Middle School, where he posted a 32-3 record. He coached at Franklin Community High School as a JV coach, then as the varsity head coach, winning the Mid-State Conference and the Johnson County Tournament. He then became the varsity assistant at Perry Meridian in 2003 for five years under John Carpenter. He was also the Director of Baseball Camps for the University of Dayton for 12 years under the direction of head coach Tony Vittorio.

Pieper joined the Roncalli staff as the freshmen coach for one year before becoming the varsity assistant, becoming a part of the team that won the 2016 State Championship, as well as county, conference and sectional titles. He is a long-time south sider, who has been involved in youth sports across Perry Township and Indianapolis. He has three children and three grandchildren.


James Thorpe
Varsity Assistant

James Thorpe is a 1995 graduate of Southport High School. He attended Olney Central College in Illinois and played two years of baseball. Thorpe has been a Head JV Coach for 10 cumulative years. He was at Southport (2001-2003), Perry Meridian (2004 & 2014-2017) and Roncalli (2018-present). During that time, he accumulated a 108-64 record. He had the opportunity to work with and coach the 2004 (Tim LeMasters at Perry Meridian) and 2018 (Nick Schnell, Roncalli) Indiana Mr. Baseballs. Thorpe resides in Perry Township with his wife Jodi and daughters, Olivia and Ava.


Ryan Parrott
JV Head Coach

Ryan Parrott is 2011 Roncalli graduate. He then went on to play baseball at the University of Indianapolis for two years and Olney Central College for one year, playing primarily third base, but also playing catcher and first base. Parrott is currently finishing school to get his special education degree and hopes to pursue a teaching career as well as coaching. He has been instructing children and high school players ever since graduating high school. During his college career, he helped out travel organizations throughout the summer as an assistant coach. Parrott is going into his third year with the Indiana Twins travel baseball program and is the current head coach of their 15U team.


Brandon Worley
JV Assistant

Brandon Worley was an honors graduate from Perry Meridian High School in 2017. He caught on the baseball team at Perry Meridian and also played football. Worley’s interest in coaching began at a young age, when he coached recreational basketball for five years in the Perry Township Youth Basketball League. His father, Don Worley, is a 1984 Roncalli graduate. Worley is starting school in the fall to pursue a degree in secondary education and wants to stay coaching at the high school level.


John Mullin
JV Assistant

John Mullin is entering his fifth season as an assistant baseball coach for Roncalli. He graduated from Cathedral High School and began coaching in college while attending IUPUI and Indiana State University. He has coached middle school and junior high teams in both baseball and basketball. Prior to his time at Roncalli, he spent over 20 years as a volunteer umpire and board member for several youth sports programs, as well as having a successful run as coach of many school, little league and summer travel baseball teams. Mullin is employed at Fire Service Inc. as a firetruck salesman and lives on the south side of Indianapolis with his wife Pam. They have three children who attended Roncalli.