Glenn Howerton on ‘It’s Always Sunny in Philadelphia’, bad teachers, & stand-up comedy
If You Only Knew: Glenn Howerton
“I’m attracted to bitter, angry characters”: Glenn Howerton on his role in ‘A.P. Bio’
Glenn Howerton & Pete Holmes on importance of making the crew laugh
Glenn Howerton reveals his desire to try stand-up comedy
‘A.P. Bio’ star Glenn Howerton reveals if he had bad teachers growing up