Harvey "Harley" Keiner was the leader of the bullies at John Adams High. His oldest lackey is Frankie and his newest one is Joey. He tried to recruit Shawn, but was thwarted by Cory. In Back 2 School, Cory tried to make friends with him as a way to gain instant popularity but Harley instead chose to target Cory. He refers to Cory as "Johnny Baboon". He is currently a janitor at John Quincy Adams Middle School in New York.
The episode Sister Theresa reveals Harley's family life and a more sympathetic side to the bully. He has a sister, Theresa Keiner, whom he truly cares for. Apparently when Theresa was eight, their father ditched Theresa at a Phillies game to run off with another woman. Harley went out of his way to get to the Phillies game and escort her home.
Season 3 was at least his third year spent as a Senior at John Adams High School.
Danny McNulty, who played Harley Keiner, was replaced by Kenny Johnston in the episode Wrong Side of the Tracks, with no explanation given. However, after the episode Girl Meets Flaws (from the first season of Girl Meets World) aired, McNulty revealed that he was bipolar and had a breakdown during the middle of an episode, and therefore his character was replaced by Johnston for one episode before the show explained that Keiner had gone to reformatory school. After McNulty was better, he came back for one last appearance in BMW as Harley, with his character having escaped from reform school.
He became the janitor at John Quincy Adams Middle School in New York City with Cory's help.
He is now one of Cory's dearest friends as he has become a much nicer, kindhearted person who helps the children at the school. He is often shown to feel regret and remorse for his old ways.
His nickname for Cory and Topanga's daughter Riley is "Little Zippy".
He is also a mentor figure to Riley's boyfriend Lucas
He appears in the last episode of Girl Meets World, but in a non-speaking cameo.