Kris Jenkins

On Base University Hitting Certified Expert

Current ABCA Member
Driveline Youth Hitting Certification

Coach Jenkins has been coaching/training youth aging from 6 years old to the collegiate level athletes for the past 16 years. As owner of K25 Baseball/Softball and Owner/Director of Top Tier West Baseball, Coach Jenkins has worked with many athletes in the west suburban Chicagoland area. Coach Jenkins also coached at the High School level at Plainfield South High School. Coach Jenkins continues to dedicate himself to giving back to our Baseball and Softball community. Being a member of the ABCA, (American Baseball Coaches Association) and Attendee at the Slugfest Conference in 2019 has also aided in Coach Jenkins’ progressive teachings. Coach Jenkins matches his knowledge with pure intense and positive energy to his players.

As an athlete, Coach Jenkins came up through the ranks of the Aurora Boys Baseball program and due to his contributions to the sport, he was later inducted into the Hall Of Fame. Coach Jenkins’ career blossomed while attending West Aurora High School where he was a 3 Sport Athlete competing in Baseball, Basketball, and Football. Coach Jenkins received All-Conference and All-Area honors in all 3 Sports. He was a sophomore on the 2000 State Championship Basketball Team. As a senior, Coach Jenkins was awarded Athlete of the Year for his contributions to West Aurora High School.

Coach Jenkins decided to join Junior College Powerhouse Triton College to play for legendary coach, Bob Symmonds. While at Triton College, Coach Jenkins was awarded All-Conference and received a scholarship to transfer to Illinois State University. During his time at Illinois State University, Coach Jenkins earned an invite to compete against the top players in the country in the Texas Collegiate Summer League. While in Texas, he led his team to a TCL Championship. As a senior, Jenkins earned All-Conference Honors for his play.

Benny Collessano

Specialty:  Pitching & Arm Care 

Benny has been with K25 Baseball for the last 3 years.  Coach Benny specializes in Pitching/Throwing & Arm Care.  Coach Benny played at baseball powerhouse Lockport Township High School.  For his college years, Coach Ben played for Trinity Christian College in Palos Heights, IL, where he led the Trolls to the 2014 NCCAA Baseball National Champions, and was named to the National Championship All-Tournament Team .


Professional Career  After college, Coach Benny has been traveling the country pitching for several professional baseball organizations. In 2015, he played for the MRPBL Oregon City Mud Turtles.  In 2016, he competed with the Old Orchard Beach Surge of the Empire Professional League. Most recently, he started out the 2017 season in the Thoroughbred league and was promoted to play for the Traverse City Beach Bums in the Frontier League.


Pitching Philosophy  I believe that pitching is an art, and in order to achieve success, one must command pitches in and out of the zone, consistently change velocities and eye levels, achieve deception, while throwing strikes and staying ahead of hitters.  Pitchers who are successful are in full control on the mound.  Pitchers in full control have a presence about them that both teams and spectators recognize.  In order to achieve this dominant presence and be successful, a pitcher needs to incorporate an arsenal of well-polished skills.  The building blocks of polished skills are; proper mechanics, prehab/injury prevention, strength and conditioning, and IQ.  Pitchers need to learn how to use their entire body & mind to deliver every pitch with a purpose.

Carter Turnquist

Specialty:  Pitching/Fielding

High School Career  Coach Carter was a dual sport athlete excelling in Baseball and Football for the Oswego Panthers.  Immediately Coach Carter excelled, being placed on Sophomore as a Freshmen.  Coach Carter then became the Sophomore leading his Varsity team and earning him the award of Pitcher of the Year.  Coach Carter continued to be a leader on the team throughout his career and was named Team MVP along with earning All-Conference honors.


College Career  Carter began his college career attending the University of Wisconsin- Oshkosh before transferring to Aurora University.  Coach then transferred to Aurora University his sophomore season and quickly began to contribute to his team.  As a Sophomore once again, Carter began to contribute by battling as the #3 Pitcher on the mound at times and in coming out of the bullpen.  Carter plans to continue to be a great team and competitor for the Spartans this year.


Coaching  Coach Carter has coached 4 years of travel baseball. Utilizing his natural knack for the game and knowledge he has acquired, Carter looks to help athletes move on to the next level of play, but most importantly, teach them about the game of baseball and help them build their skills.

Mark Nilles

Specialty:  Strength and Mobility

Certifications:   ATC, CSCS, CES, PES, USAW

Owner Nilles Strength & Speed

Full time ATC-Dreyer Medical Physical Therapy

TCoach Mark has been training athletes of all ages from grade school through adult for the last 26 years.  

Former semi-pro baseball player-14 seasons 

Former Asst College Baseball Coach

Current MSBL baseball player

Aj Gill

Specialty: Hitting

 AJ is currently signed under a professional contract with the Chicago White Sox minor league organization. 


Gill heads to the White Sox after having completed his career as a Spartan. In two plus season with the 2020 season ending early due to the coronavirus (COVID-19) pandemic, Gill put up impressive offensive numbers. In 99 games, he hit .335 with a .543 slugging percentage, collecting 121 hits in 361 at bats. Of his 121 hits, 41 went for extra bases with 21 doubles, 14 home runs and six triples. Gill drove in 94 runs while scoring 85 and he also reached base 48 times with a base on ball.

Following the 2019 season, Gill All-Region (Midwest) First-Team outfielder by and American Baseball Coaches Association (ABCA) and a Northern Athletics Collegiate Conference (NACC) First-Team outfielder. Entering the 2020 season he was named a Second-Team preseason All-American by Gill was a cog in the Spartan baseball resurgence to the national scene as the 2018 and 2019 Spartans won NACC tournaments and made NCAA regional appearances. The 2020 team was ranked 17th with a 9-2 record when the season was ended.

Jorge Garza

Infield Specialist/Hitting

Born and raised in Rockford, IL. Jorge attended Boylan Central Catholic High School, graduating in 2007. In 2008, he signed with Coach Bill Angelo & Elgin Community College. In Jorge's Freshman year of 2008, the Spartans won the North Central Region IV DII tournament to advance to the NJCAA DII World Series in Millington, Tennessee for a 5th consecutive year, placing 5th overall. In 2010 he went on to play infield at Robert Morris University where they won the CCAC tournament and advanced to the National Tournament for the 1st time in school history. In the summer of 2010, Jorge played 2nd base for the Rockford Foresters in the inaugural season of the Midwest Collegiate Baseball League and went on to win the MCBL Championship.

In the Fall of 2011, Jorge began his coaching career as a Graduate Assistant with the Robert Morris Eagles. In the summer of 2012, Jorge was an Assistant Coach on the Dupage Hounds of the MCL. In the summer of 2014, Jorge Managed the Joliet Admirals in the MCL as the youngest Manager in League history.  In the fall of 2014 he began coaching with Top Tier as a 16u Nationals and 17u Nationals head coach in 2015 and 2016. He was the head coach of the Top Tier 15u Americans team as well as the director for the 10, 11u, and 12u youth programs and the Top Tier Academy Operations Leader.   Garza has trained professional players as well as college players.  

200 Alder Dr. 

North Aurora, IL


Phone: (630) 618-4658

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Oswego, IL