Athletic Trainer Bios
San Francisco Giants
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Senior Director of Athletic Training

Dave Groeschner

Dave begins his 6th season as Senior Director of Athletic Training for the Giants and 27th season overall with the Giants. Dave was the Head Athletic Trainer for 11 seasons from 2007- 2017. Groeschner spent the 2005 and 2006 seasons as the Giants Assistant Athletic Trainer in his second stint with the Giants after having spent the 2004 season as the Head Athletic Trainer for the Chicago Cubs. Groeschner previously had spent four seasons in a dual role as the Assistant Athletic Trainer and strength and conditioning coordinator for the Major League club. He served as Athletic Trainer for the triple-A Fresno Grizzlies during the 1999 season, after logging two years at single-A San Jose and one campaign at rookie-league Bellingham. Groeschner served as the Giants Minor League Medical Coordinator during the 2000 and 2001 seasons. Dave served as Athletic Trainer for the 2007 All Star Game in San Francisco. He earned a Bachelor’s degree in physical education from the University of South Carolina. Groeschner is a member of the National Athletic Trainers Association and is licensed in the State on Arizona. He and his wife, Aimee, and daughters, Katie and Karmyn, reside in Mesa, Ariz.

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Head Athletic Trainer

Anthony Reyes

Anthony begins his 6th season as head athletic trainer for the Giants, 12th season overall with the major league club. He served six seasons as Assistant Athletic Trainer. Reyes previously spent four seasons as the athletic trainer for the triple-A Fresno Grizzlies (2008-2011). He also spent two seasons (2006-07) with double-A Connecticut and worked with the Arizona Rookie team in 2005 after completing an internship for the Major League club in 2004. He earned a Bachelor’s degree in Kinesiology from San Jose State University in 2004. Reyes is certified by the National Athletic Trainers’ Association and also holds a certification with the National Strength and Conditioning Association. Anthony and his wife Fay, along with their daughters Amelia and Audrey, reside in Martinez, Calif.

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Assistant Athletic Trainer

L.J. Petra

L.J enters his fourth season as the Major League Assistant Athletic Trainer. The 2004 University of Connecticut graduate has worked as an ATC at every level of the Giants organization from 2009-2017, as well as serving as the Minor League Medical Coordinator in 2018 and 2019. In 2020, L.J served as the Head of Health and Safety Protocols for the Liga de Beisbol Dominicano. In this role he was tasked with overseeing all aspects of medical policy, testing and treatments pertaining to the COVID-19 pandemic. During the 2013 winter season he worked as the Head ATC for Tiburones de la Guaira of the Venezuelan Baseball League. Before joining the Giants organization, L.J spent 2007-08 as the Assistant Athletic Trainer and Head Strength and Conditioning Coach for the Bowie Baysox, Double-A affiliate of the Baltimore Orioles. L.J has enjoyed speaking engagements for the San Francisco Giants Sports Medicine Conference, Sacramento State Athletic Training Education Program, Sacred Heart Athletic Training Education Program, California Physical Therapy Association and the California Concussion Institute. L.J currently resides in Scottsdale, Arizona with his wife Carly and their two children; Ellie (9) and Austin (6).