Conversation so far:
was Kevin Smith a writer?
In 1997, Kevin Smith was hired by New Line to rewrite Overnight Delivery, which was expected to be a blockbuster teen movie.
was the movie Overnight Delivery, rewritten by Kevin Smith made?
Kevin Smith's then-girlfriend Joey Lauren Adams almost took the role of Ivy in the movie, instead of the female lead in Chasing Amy.
what did Kevin Smith's then-girlfriend Joey Lauren Adams go on to do instead of the female lead in Chasing Amy?
Eventually Joey Lauren Adams lost out to Reese Witherspoon, and Overnight Delivery was quietly released directly to video in April 1998.

Question: what was his greatest accomplishment?
Self-contained rewrite: what was Kevin Smith's greatest accomplishment?