The Team
Our dedicated coaching staff brings a wealth of knowledge and experience to the field, providing personalized instruction and guidance to help each player reach their full potential. Through innovative training techniques and state-of-the-art facilities, we aim to elevate your game to new heights.
COACHES
Co-Founder & Hitting Coach
Andre Marshall
Andre Marshall, outfielder and switch hitter, played for the Washington Huskies. Drafted by the Philadelphia Phillies, he went on to play minor league baseball for seven years.
Andre has been a hitting instructor for over 20 years and has had hundreds of high school players go on to both college and professional baseball. For 12 years, Andre coached at Mercer Island High School, where he won two state championships and coached outfield hitting and baserunning.
Co-Founder & Pitching Coach
Sean White
Sean White is a former professional baseball player with a distinguished career both on and off the field. Growing up in Mercer Island, Washington, Sean showcased his pitching skills at Mercer Island High School. Opting for collegiate baseball over an immediate professional start, he attended the University of Washington.
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As a Husky from 2000 to 2003, he excelled as a starting pitcher, earning All-Pac-10 honorable mentions in both 2002 and 2003. Over four seasons with the Mariners (2007-2010), he maintained a win-loss record of 4-4 and an ERA of 4.16. His peak performance in 2009 included a 2.80 ERA across 52 outings, earning him the title of Mariners’ 2009 Unsung Hero by the Baseball Writers Association of America.
Director of Baseball Operations
Dan Rickert
Dan Rickert graduated from Tyee High School in 1997. While at Tyee, Dan earned 1st team All-Seamount League honors as a middle infielder his Sophomore, Junior and Senior seasons. After graduating from Tyee, Dan went on to play JUCO baseball at Tacoma Community College (TCC). In his freshman year at TCC, Dan was named 1st team All-Western Division infielder as a 3rd baseman. As a sophomore, Dan was named 2nd team All-Western Division Infielder and 1st team All-NWAACC tournament team as a 2nd baseman.
Dan graduated from the University of Washington in 2002 with a degree in Sociology. After graduating, he played in the NABA and PSSBL baseball leagues for over 10 years. He has had a lifelong passion for baseball and has been coaching youth teams ever since he hung up his spikes as a player.
Pitching Coach
Mason McAlister
Mason graduated from Yukon High School, Oklahoma, in 2014. He went on to pitch for Cowley College, Kansas, won a conference championship and played in the D1 JUCO World Series.
In 2016, Mason transferred to Oklahoma Christian University and received an All-Conference Honorable Mention. For two years, Mason coached college baseball in the PIL and WCL leagues with the Redmond Dudes. In addition, he posted a career 3.77 ERA in three professional seasons in Independent Leagues (partner of MLB Leagues) and has 3+ years of experience training athletes to be more efficient in their movements and patterns.
Director of Coaching & Player Development, College Placement Advisor
Eddie Cribby
Coach Cribby brings Division I college coaching experience to Boost Baseball, having coached at Villanova University, Saint Peter’s University, and Fordham University. Most recently, he coached at Villanova University during the 2023–2024 season, working with the catchers, assisting with hitters, and coaching first base.
Prior to Villanova, Coach Cribby had coaching stops at Saint Peter’s University in New Jersey and Fordham University in New York, leading an infield group that placed Fordham #1 fielding percentage in Atlantic-10 Conference play. He also spent a summer in the Northwoods League as Bench Coach and Hitting Coach for the Rochester Honkers, working with several future MLB draft picks.
Coach Cribby is excited to be back in the training facility environment, working closely with high school players and the next generation of athletes. With its incredible Bellevue location, Boost Baseball is uniquely positioned to serve players from across the Eastside and greater Seattle area, providing a premier training environment focused on long-term development and preparing athletes for the next level.
Program Coordinator and On-Field
Operations Lead.
Garret DeGallier
With 10+ years in the college baseball landscape (2015 - 2025), Garrett has held multiple roles as an assistant coach across Concordia University, University of the Pacific, Seattle University, and served as Head Coach of a WCL collegiate summer team. Across his stops, he has coached outfield, infield, hitters, and baserunners, led recruiting efforts, run revenue generating camps, and directed player development and operations.
As a player (2011-2015), DeGallier competed at Tacoma Community College and the University of South Alabama, where he was part of a 2015 Sun Belt Conference Championship team.
Garrett specializes in motivating athletes through developing disciplined baseball and life skills—helping them better understand who they are and what they need to be great—while building high-performing players.