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.


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

Kheylin Smith

Baseball Instruction

Kheylin Smith:  Former De La Salle Spartan, current De La Salle coach, UCLA Bruin, Italian Professional League Manager


Eddie Christian

Hitting Instruction
Phone: 510-600-3448

Eddie Christian:  Played 8 seasons of professional baseball in the Marlins, Angels, and Mariners organization reaching the AAA level in 1999.  Drafted in MLB draft by the Seattle Mariners in 1988 out of Salesian HS and again in the 1992 draft by the Marlins out of Cal State – Long Beach.  Currently provides professional baseball instruction for dedicated athletes and trains numerous players in the Bay Area.

Check out Eddie's website at

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.


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

Mitchell kranson

Baseball Instruction

Mitchell Kranson:   East Bay Athletic League MVP as a Senior at De La Salle.  4-year starter at CAL.  Drafted by the Minnesota Twins in the 2016 MLB Draft.



Baseball Instruction

Trevor Ryan: A native of Chico, CA, UCLA graduate, and current Oakland A's scout, Trevor has an extensive background working with players at the highest level, both collegiately and professionally. Starting with time on John Savage's staff at UCLA, Trevor served as Director of Baseball Operations in 2010 and 2011 as well as Bullpen Coach in 2011 for a team that produced many MLB draft picks, including Major Leaguers Gerrit Cole and Trevor Bauer. Following his time at UCLA, Trevor was hired by the A's where he served as an Area Scout for 4 years. In 2015, Trevor was promoted to his current role of Professional Scout, where he now spends his time evaluating other Major League and Minor League players.

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.


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