Before joining Milwaukee, Anderson spent three seasons as the Head Athletic Trainer for the Asheville Altitude of the National Basketball Developmental League. His duties with Asheville also included head equipment manager and travel coordinator.

Before working with the Altitude, Anderson worked as the Head Athletic Trainer for the Yakima Sun Kings of the Continental Basketball Association for two seasons and as the Head Athletic Trainer for the Yakima Shockwave of the National Indoor Football League. He worked as a Physical Therapy Aide for Cascade Summit Physical Therapy and as an Athletic Trainer Intern for the Seattle Seahawks of the National Football League during the 1998 season.

Anderson has also served as a Graduate Assistant Athletic Trainer for the University of Oregon and has worked for the Boston Celtics in the Reebok Summer League, at the Motor City World Games and in various degrees for the Seattle Mariners. He received his Bachelor of Science Degree from Arizona State University and his Master of Science Degree from the University of Oregon.

John was married to Sandra Vasquez on August 11, 2007. The newly married couple makes their home in Oak Creek.