Athletic Trainer Bios
Chicago Cubs
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Director of Athletic Training

Mark O'Neal

Mark joined the Chicago Cubs in 2004 as Head Athletic Trainer and was promoted to his present role as Director of Medical Administration’s in October of 2012. Having spent his previous 15 sea- sons in the St. Louis Cardinals’ organization, Mark joined the Cardinals major league staff in 1998 as the medical and rehabilitation coordinator and was promoted to assistant athletic trainer in 2003. En route to the major leagues, Mark made stops in the Cardinals’ farm system at Savannah (A), Arkansas (AA) and Louisville (AAA). He is a Certified Member of NATA, a licensed athletic trainer in the states of Illinois, Arizona and Missouri, a member of the Missouri Board of Healing Arts and a member of the NSCA. Mark had the honor of working the 2009 All-Star game in St. Louis. In 2008 Mark joined Cubs’ Assistant Athletic Trainer Ed Halbur in being named the 2008 Major League Athletic Training Staff of the Year, and in 2007 Mark was elected Secretary of the Professional Base- ball Athletic Trainer’s Society’s Executive Board. In December of 2013, Mark was unanimously elected by its membership to be President of PBATS. In his first year in that position Mark reinvigorated tobacco education in baseball and established ProTep, the Professional Tobacco Education Program. Mark also works with MLB and USA Baseball on instructions and injury prevention pro- grams for young people. A graduate of the University of Arkansas, he worked for the football and basketball teams while an undergraduate and graduate assistant. Mark has a private pilot’s license and enjoys flying with his sons. Mark and his wife, Stefanie, reside in Chicago, Ill., during the off- season with their three children (Conner, Cade and Kyle).

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Head Athletic Trainer

PJ Mainville

PJ begins his fifth season as the head athletic trainer for the Chicago Cubs. Prior to joining the Cubs, he completed the previous two seasons (2011-2012) as the assistant athletic trainer for the Arizona Diamondbacks. Mainville spent the past 13 years in the Minor Leagues with the Baltimore Orioles and Arizona Diamondbacks. He served as the Minor League Medical & Rehabilitation Coordinator from 2007 to 2010 for the Diamondbacks. Prior to the 2007 season, he was the Head Athletic Trainer for the AAA Ottawa Lynx (2004-2006), AA Bowie Baysox (2001-2003), High-A Frederick Keys (2000), Low-A Delmarva Shorebirds (1999), and Rookie Bluefield Orioles (1998). He began his interest in professional baseball as an undergraduate intern with the Baltimore Orioles in 1996 and 1997 while attending East Carolina University. A certified member of the NATA, Mainville later earned his Masters of Science degree in Performance Enhancement from California University of Pennsylvania in 2005. A native of Warrenton, VA, Mainville now resides in Chicago, IL with his wife, Michele, and children Kylie, Caden, and Carter.

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Asst. Athletic Trainer

Nick Frangella

2018 Bio Coming Soon!

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Asst. Athletic Trainer

Matt Johnson

Matt is in his fifth season as assistant athletic trainer for the Chicago Cubs. Matt joined the Cubs’ major league staff after serving as an athletic trainer in the Cubs’ minor league system for 10 years. Matt has made stops at Mesa (Rookie), Boise (Short-Season), Peoria (A), West Tenn. (AA), Tennessee (AA), and Iowa (AAA). Matt was the athletic trainer for the Iowa Cubs from 2008-2011. In 2008, he also served as the athletic trainer for the Aguilas de Cibaenas in the Dominican Winter League. Matt graduated from Ohio University with a Bachelor of Science degree in athletic training. He earned a Master’s degree from Boston University in applied anatomy and physiology. Matt is a Certified Athletic Trainer (NATA), Certified Strength and Conditioning Specialist (NSCA), a Corrective Exercise Specialist (NASM), and has his CFAS (Gray Institute). Matt was born and raised in La Grange Park, IL. He and his wife Rachel, reside in Stow, Ohio with their sons Sam and Brian.