The Fieldhouse offers one-on-one and small group lessons.  
Check out our awesome instructors.


Don Gieseke

Baseball Instruction
Phone: 925-446-6568

Don Gieseke:  Played and coached baseball at the amateur level for 40 years (since 5!).  Passionate about the game, especially in helping parents and kids to teach and play the game correctly and to use the baseball experience as a spring board to becoming a community leader.  Currently runs The Fieldhouse and is a board member of More Than A Game, a non-profit organization that focuses on excellence in athletics and leadership thru community service.

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Matt Jarvis

Baseball Instruction
Phone: 916-749-6241

Matt Jarvis: Matt  has a proven track record with numerous young pitchers who have gone on to pitch for their high school and college teams.   Matt not only teaches proper pitching mechanics, but also is a great teacher of the mental aspect of the game. Matt played 14 years professionally as a left handed pitcher. His skill and professional baseball experience will help you to take your game to another level. Matt has a thorough understanding of the game, both on and off the field.  He has successfully  provided private baseball instruction, training schedules and mentoring in the Bay Area and Greater Sacramento, since 2001.

Check out Matt's website at

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Katelyn Heinrich

Softball Instruction

Hi my name is Katelyn Heinrich or "Kat". I played 4 years of collegiate softball as a pitcher, hitter and 1st baseman. I was an assistant coach at the college level as well, coaching at the NAIA and NCAA levels. I have attended many skills camps and trained with many college coaches. I specialize in pitching and hitting but also train catchers and infielders. My goal is to work with each athlete on an individual and group level to become the best player they can be.

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Softball Instruction
Phone: 925-567-4346

Hi! My name is Octavia Bond, and I played 3.5 years of softball at Cal as an outfielder and slap hitter. I also coached for the NorCal Bears organization for 3 years for ages 13U, 14U, and 16U. During my time at Cal I coordinated multiple softball camps from ages 7-18, and loved working with each girl on their own personal strengths and weaknesses. While I was an outfielder and slap hitter in college, I played shortstop and was a power hitter as well growing up, being able to provide versatility to the field. I specialize in teaching outfield, slap hitting, and middle infield. While those may be what I specialize in, I am dedicated to help each and every girl become the best athlete they can possibly be regardless of their position on the field. In addition to this, I am a firm believer in helping my girls create success for the future off the field as well through the concept of life lessons taught by the game of softball (and baseball).

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Baseball/Softball Instruction
Phone: 925-448-1724

Founded on the principles of Communication, Consistency, Confidence, and Character, Diamond Kids Baseball provides youth with the opportunity to learn & play baseball and softball, making the game accessible to all youth, and cultivating the athletic and life skills to succeed on and off of the diamond.

DKBA was created to provide our youth with the opportunity to learn, grow, and master the fundamentals of the game, improve their overall skill level, and build solid values and character traits that will last a lifetime.

Shaun resides in Concord, CA with his wife and two sons. Shaun has played and coached at various levels, ranging from tee ball, little league, travel/tournament ball, high school, college, and semi-professional. Shaun combines his love, experience, and knowledge of the game, enthusiasm for working with players of all ages, and his professional background to teach the game.

  • MBA, Sports Management emphasis, Saint Mary’s College of Moraga, CA
  • BA in Communications, minor in Psychology from UC Davis
  • Selected in the Major League Baseball amateur draft by the Minnesota Twins

Photo by jpbcpa/iStock / Getty Images


Fastpitch Softball Instructor
Phone: 650.438.2312
Abigail is a Bay Area native and former Division I pitcher at UC Santa Barbara.  Since 2002, Abigail has been giving private pitching lessons and clinics to softball players around the Bay Area, with several of her pitchers going on to play at the collegiate level.  Abigail specializes in pitching and works with girls of all ages and skill levels, from developing and perfecting fundamental pitch mechanics to advanced pitch count strategies and game management.  

Abigail has a thorough knowledge of the game and is passionate about girls participating in sports.  With over 15 years’ experience as a communications executive, Abigail knows firsthand the life lessons learned from training and working hard to perfect a skill.   

Recognitions while at UCSB:

·         Known as UCSB’s “ace.”

·         Led UCSB in most pitching categories, including earning a “top ten” spot on UCSB softball’s most wins in a season list.

·         Big West Pitcher of the Week.

·         Santa Barbara News-Press Athlete of the Week.


Mike Nisco

Baseball Instruction


Michael Nisco:  Pitched for St. Mary's College (D1), and professionally in the Italian Baseball League. Varsity Pitching Coach at De La Salle HS,  Pitching Coach at Northeastern State University (D2), and CSU Northridge (D1) - Volunteer Coach.  Currently an Associate Scout with the Washington Nationals.


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Brett Thomas

Baseball Instruction


Brett Thomas:  Brett brings a great deal of experience of teaching the catching position. After his playing days at Cal in the Pac-12 Conference Brett immediately broke into coaching. Since his playing days he has coached in Division 1, Junior College and high school baseball and in just 7 years of coaching has had four catchers drafted and ten catchers receive scholarships to Division 1 schools. Brett runs the Catching Academy where he teaches catching all over the Bay Area. 

Check out Brett's website at

Mark raciopPO

Phone: 925-360-4381

Baseball / Softball Instruction

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Mark Racioppo: Coach Mark is a graduate of nearby St. Mary’s College who began his coaching career in 2001 with San Ramon Valley LL, where he was a head baseball coach for 12 years, including tournament and district teams. His softball coaching career spans 16 years, beginning with SRVGAL in 2006, where he coached for 8 seasons. He then became the head softball coach at Monte Vista High School in Danville for 5 years and is currently coaching softball at Las Lomas HS in Walnut Creek. He has worked as a private hitting and instructional coach for the past 8 years, working with students ages 8-17 of all abilities. Mark is a great communicator and emphasizes executing proper fundamentals that allow students to feel comfortable and understand the ‘why’ behind what they are learning.

For more information,
contact Don Gieseke at or
call 925-446-6568 /