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Jim Hallman, Owner

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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 10th year as a High School Baseball coach. For the past 5 years Mick has been 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 beginning his first year as the Varsity Hitting and Catchers Coach at Northwest High School in Waukee in 2023.

John Bisignano, Strength and Conditioning Director

John is entering his 6th year with Grand Slam U.S.A. serving as one of our managers, lead pitching instructor, and recently our strength and conditioning director with the addition of our new strength and conditioning program, Grand Slam Strength. John is a Des Moines native, playing his high school ball at Dowling Catholic, and going on to play at Southwestern Community College, University of Nebraska-Kearney, and Grand View University, where he graduated with a degree in Kinesiology. John has combined his background in exercise science and baseball to develop numerous new programs to help further drive our player development here at Grand Slam, and open the doors to athletes of all sports with the addition of Grand Slam Strength. Outside of Grand Slam, John enjoys spending time with his wife Maddie and their 3 pets and is a competitive powerlifter.

Mike Joseph, Instructor, Youth Camp Director

Mike is beginning his 3rd year instructing with Grand Slam serving as our lead catching instructor and recently taking the role as Youth Camp Director. 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 a coach and board member with the Van Meter Heaters softball club. 

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