Famous for his portrayal of bully Harvey "Harley" Keiner in the 1990s television series Boy Meets World, he played an older version of the same character in the 2014 series Girl Meets World.
He made his television debut in a 1993 episode of the crime drama Street Justice.
He wrote, produced, and acted in a short film titled Live4 2Day.
A native of Springfield, Illinois, he later lived and worked in New York and California.
Ben Savage's Boy Meets World character, Cory Matthews, was the Season 2 target of McNulty's character's bullying.