New Jersey native Tim Walsh returned to the metropolitan area for the 2000-01 NBA season and is beginning his 16th season as head athletic trainer for the Nets. Walsh spent 1997-2000 in a similar position with the Orlando Magic after serving as assistant trainer for the New York Knicks for 13 seasons. Walsh, a certified member of the National Athletic Trainers Association, the American College of Sports Medicine and the National Strength Conditioners Association, oversees the immediate medical needs of the team's players, including the prevention, treatment and rehabilitation of injuries.

A graduate of Upsala College, Walsh joined the Knicks in 1984, where he played an integral role on the Knicks' training staff. In addition to his training duties, Walsh took on the added responsibilities of attending to New York's practice and training facilities, while also being responsible for the supervision of player equipment and uniforms.

Walsh is a Performance Enhancement Specialist, certified by the National Academy of Sports Medicine. He served a two-year term as chairman of the National Basketball Athletic Trainers Association from 2004-06. A three-time winner of the 'Trainer of the Year' award as named by the National Basketball Athletic Trainers Association, Walsh was honored in 2004, 2014 and 2015. During the 2014-15 NBA season, Walsh also earned a HeartSaver award from the American Heart Association after he and his staff acted heroically to aid a member of the Nets’ coaching staff who had suffered a heart attack during a team practice.

In 2003, Walsh was named by USA Basketball as an athletic trainer for the 2003 and 2004 USA Basketball Men's Senior National Team, serving as the team's trainer in the 2004 Olympics in Athens, Greece. During his tenure with the Nets, Walsh has added three All-Star Games to his credentials, as he worked the 2002 NBA All-Star Game in Philadelphia, the 2008 NBA All-Star Game in New Orleans and the 2015 NBA All-Star Game at Madison Square Garden. In October of 2009, Walsh was inducted into the Newark Athletic Hall of Fame.

Walsh attended Essex Catholic High School, where he was a two-time All-County catcher and team MVP as a senior. He was named Essex Catholic's outstanding athlete as a senior for both his exploits in football and baseball and in 2011, was inducted to the Essex Catholic High School Hall of Fame. As a catcher at Upsala College, Walsh helped lead his team to three NCAA Division III Championship Tournaments.

In 2010, Walsh made his big screen debut, playing himself in the movie Just Wright, starring Queen Latifah.

Tim and his wife, Kathy, have two children, a daughter, Lauren Frances and son, Stephen Philip, and they reside in Washington Township, New Jersey.