Baseball Coaching Staff

Aaron Kroll

Varsity Head Coach

After graduating from Burlington High School in Burlington, Iowa in 1998, Coach Kroll attended Coe College where he earned his Bachelor's degree in education. He also played four years of baseball as a 1st 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.

Coach 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, the school’s first since 1996. Coach 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 6th year leading the Rebels, and looks forward to building upon Roncalli’s successful baseball tradition.

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


Mark Pieper

Varsity Assistant Coach

Coach Pieper returns to the staff as a varsity assistant coach. He has been involved in coaching baseball for over thirty years, the last 5 years at Roncalli. He started at Southport Middle School coaching 7th and 8th grade. He was an assistant coach at Franklin Community High School for 10 years before becoming head coach for another 2 years. During that time as head coach Franklin won two Mid-State Conference Championships and one Johnson County Championship. After leaving Franklin, he went to Perry Meridian High School and worked as an assistant coach for five years. For the past 5 years, Coach Pieper has worked as the Camp Director for the University of Dayton Baseball Camps under the direction of head coach Tony Vittorio.

Coach Pieper has been a long time resident of the south side of Indianapolis and has 3 children and 3 grandchildren.


James Thorpe

Varsity Assistant Coach

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 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

Head JV 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 Coach

Brandon Worley was 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 Coach

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. Coach 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.