Director of Medical Services
PJ enters a new role in the 2023 season as the Director of Medical Services after having served ten seasons 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 13 years in the Minor Leagues with the Baltimore Orioles and Arizona Diamondbacks organizations. He served as the Minor League Medical & Rehabilitation Coordinator from 2007 to 2010 for the Diamondbacks. Prior to the 2007 season while serving in the Baltimore Orioles minor league system, 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.