Dr. Bill Harrison  began his work in professional baseball began in 1971 with the Kansas City Royals. 
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​Baseball Hall of Fame star George Brett was among the first players he trained. Since that time, he has worked with 12 MLB organizations, and many NCAA baseball programs. Most recently he and his company have worked with the Toronto Blue Jays and San Francisco Giants. Among the coaches and baseball leaders who participated in his training programs were Jack McKeon, Syd Thrift, Rex Bowen, Branch Rickey, Jr, John Schuerholz, Charley Lau, Mel Didier, Harry Dunlap, Karl Kuehl and Bam-Bam Meulens. College coaches include Augie Garrido, Gene Stephenson, Bob Bennett, John Scolinos, Andy Lopez, Pat Casey and many others. Through the years he has worked hundreds of baseball stars including position players, Lou Piniella, Frank White, Rod Carew and Tony Gwynn in the 1980’s, Sammy Sosa, Barry Bonds, Jason Giambi, and Shawn Green in the ‘90’s; Carlos Beltran, Mike Sweeney, Sean Casey, Jose Guillen, Jonny Gomes, Adam Dunn, Angel Pagan, Giancarlo Stanton and Hunter Pence in the 2000’s. Pitchers include Paul Splittorff, Ron Bryant, and Bert Blyleven in the 1970’s, Doug Drabek, Steve Trachsel, and Pete Harnisch in the 90’s; Greg Maddux, Jason Johnson, Mark Hendrickson, Bronson Arroyo and Danny Graves in the 2000’s. Many consider him to be one of this country's premier minds for sports enhancement as countless world-class athletes prepare for competition with Dr. Harrison's concepts in their training programs. A frequent contributor to Collegiate Baseball News and the co-author with Ryan Harrison of recently released books, “How2Focus: Like the Pros,” “How2Focus: The Hitter’s Zone,” and “How2Focus: The Pitcher’s Zone.”