Baseball Instructors

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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Baseball/Softball Instruction
Phone: 925-448-1724

Coach Shaun has played and coached baseball at various levels ranging from tee ball, little league, travel ball, camps, clinics, high school, college, and semi-professionally. He utilizes his love, experience, skills and knowledge of the game, enthusiasm for working with players of all ages & skill levels, and his professional background to teach the game.

In 2016, Shaun founded Diamond Kids Baseball Academy. DKBA provides baseball & softball players with opportunities to master the fundamentals of the game, improve their skills, and build solid values and character traits that will last a lifetime. DKBA focuses on making the game accessible to all players of various skill levels and ages, while developing athleticism and life skills to succeed on and off the diamond.

Check out for more information.

  • 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 (H.S.)

  • Walnut Creek Crawdads: Summer Collegiate Hitting Coach

  • Walnut Creek Little League: Hitting Instructor

  • Lamorinda Baseball: 10U/9U Travel Ball Coach

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

For more information,
contact Don Gieseke at or
call 925-446-6568 / 925-708-6427