John Bernard "J.B." Gaynor (born July 15, 1990) is American former teen actor. He is perhaps best known for playing Young Eddie in Grounded for Life and T.J. (Tommy) Murphy in Boy Meets World and reprises his role on Girl Meets World.
J.B. Gaynor was born in Harbor City, California, to John and Mary Gaynor. When J.B. is in elementary school, his favorite subject is math. JB decided to pursue an acting career growing up watching his sister, Jennifer. Jim Carrey and John Travolta have influenced the young star. J.B. would like to be a basketball player or a veterinarian.