Jim Hallman, Owner
Mick Delaney, Manager
Mick has been at Grand Slam since 2014. He is in charge of the day to day office operations as well as doing both group and individual lessons. Mick averages over 20 hours of lessons per week doing both hitting and catching lessons, as well as working with High School Softball teams for their offseason hitting programs. Throughout the year Mick has over 70 clients he works with for both Baseball and Softball. He is entering his 13th year as a High School Baseball coach. For 5 years Mick was the Varsity Hitting and Catchers Coach at Urbandale High School helping lead the J-Hawks to back to back State Championships in 2018 and 2019. He is in his fourth year as the Varsity Hitting and Catchers Coach at Northwest High School in Waukee.
Ryan Hulse, Assistant Manager and Instructor
Ryan Hulse is the Assistant Manager and an instructor at Grand Slam USA. A native of Boone, Iowa, Ryan has been involved in baseball as a player, coach, and instructor for most of his life.
Ryan played collegiate baseball at Grand View University for five years as a third baseman. Following his playing career, he continued his involvement in the game through coaching and player development. Ryan has three years of experience coaching USSSA baseball and has worked with players ranging from youth baseball through the high school level.
As an instructor at Grand Slam USA, Ryan specializes in hitting, pitching, and fielding instruction. His approach focuses on building strong fundamentals, helping players understand the “why” behind what they are learning, and adapting instruction to fit each individual athlete.
In addition to instruction, Ryan helps oversee the day-to-day operations at Grand Slam USA and assists with leagues, camps, clinics, select teams, and other player-development programs offered through the facility.
Ryan's goal is to help each athlete become a more complete baseball player while developing the confidence, competitiveness, and work ethic needed to continue improving and reach their goals.
Photo Credit: Alli Stuhr Photography
Photo Credit: Alli Stuhr Photography
Photo Credit: Alli Stuhr Photography
Mike Joseph, Instructor (hitting and catching), Slammers Coach and Staff
Mike is beginning his 6th year instructing with Grand Slam serving as our lead catching instructor. Mike graduated from Dowling Catholic High School and went on to play college baseball at St. Olaf College in Northfield, Minnesota. He has an extensive coaching background at the high school and club levels, having coached at Roosevelt, Dowling Catholic, and currently serving as assistant coach with Jim's 18U Iowa Slammers fastpitch club.
Mike is also the manager of Grand Slam Strength, the Strength and Conditioning program.
Outside of Grand Slam, Mike is married with 4 children and works full time home remodeling and carpentry.
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Austing Errthum, Mental Performance Coach (CMPC)
Austin Errthum has been a Certified Mental Performance Coach (CMPC) since 2022, earning his master's in Sports and Exercise Psychology after previously teaching and coaching in the Des Moines area. Austin specializes in helping athletes perform optimally by creating a mental toolkit that builds confidence and handles pressure effectively. He has worked with athletes ranging in age from 9 to the professional level. Austin played both Division I football and soccer in college before earning a brief stint with the Kansas City Chiefs in 2019. In his free time he loves to travel, watch the Red Sox, and spend time with his family.
Anthony Moist, Player, Instructor, and Student of the Game
Anthony is a dedicated redshirt freshman at Grand View University, where he continues to pursue his academic and athletic goals. As a passionate baseball enthusiast, Anthony has also established himself as a front desk manager and a baseball and softball instructor at Grand Slam USA, marking his third year as a valued employee.
Under the mentorship of Jim Hallman, Anthony has gained hands-on, professional teaching experience, learning how to effectively communicate and instruct young athletes. His current role as an assistant coach at Grand View further enhances his understanding of coaching techniques, emphasizing the importance of teaching players how to learn and understand the game rather than simply telling them what to do. Anthony believes that guiding players through personalized instruction is crucial to their development and future success on and off the field.
A former three-year varsity starting pitcher in high school, Anthony made a significant impact on his team. During his junior year, he achieved 13 starts with an impressive sub-2 ERA, ranking him among the top 25 pitchers in the state of Iowa. Now pitching at the collegiate level, Anthony is eager to continue developing his skills and compete at a high level.
Beyond his athletic pursuits, Anthony is committed to giving back to the sport that has provided so much for his family. His passion for baseball, combined with his dedication to teaching and mentorship, drives him to help others succeed both on and off the field.
Jesse Correll, Instructor
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Kaleb Krier, Instructor
Kaleb played high school ball at Southeast Polk (all state) and played collegiality at DMACC (All Conference), Valparaiso, and Grand View University (Conference pitcher of the year). He currently coaches at Grand View. Kaleb's is experienced in primarily pitching instruction, along with fielding (infield/outfield) and hitting. His passion for for baseball and youth athletes will help them become the best version of themselves. He is currently a grad assistant at Grand View University where he helps with Pitching.
Genevieve York, Instructor
Genevieve York is a senior at Dallas Center-Grimes High School and a dedicated softball athlete with four varsity letters, beginning in eighth grade. Over the past two seasons, she has earned Second Team All-Conference honors in the Little Hawkeye Conference and helped her team advance to the state tournament as both a quarterfinalist and semifinalist.
In addition to her high school career, Genevieve continues to compete with her club softball team during the fall. She has also assisted with team practices and camps throughout her playing career, working with athletes of all ages and ability levels.
Genevieve is passionate about growing the sport of softball and helping players develop both on and off the field. She believes athletes should receive individualized instruction and support so they can become the best players they can be physically and mentally. Just as importantly, she strives to help athletes grow in confidence, character, and enjoyment of the game.
Genevieve plans to continue her softball career at Indian Hills Community College, where she will major in Exercise Science and Kinesiology.
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Hailey Askland, Insturctor​
Hailey Askland grew up about an hour from the area and has played softball since Little League. Her experience includes travel ball and high school softball, where she developed into a versatile, all-around player.
Although pitching was her primary position, Hailey also played as a utility player and gained experience across the field. Her pitching ability earned her numerous college opportunities, including a full-ride offer to pitch at the University of South Dakota.
Hailey continues to play today on a women’s fastpitch team. Pitching has always been her passion, and she is excited to help younger athletes build confidence, develop their skills, and excel in the circle.
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Sami Felt, Instructor
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