Author has written 4 stories for Harry Potter.
I teach English Literature at an Asian university, including occasional courses in Children's Literature. I've been a fan of the Harry Potter books from the beginning.
If I had a vote for the Fan Fiction Hall of Fame, my candidates for inaugural members would probably be:
Arabella and Zsenya, for After the End (posted on Sugarquill dot net);
BarbL, especially for the "Triangle Prophecy" trilogy (posted here; other works posted on fictionalley dot org)
Chris Widger for the Grey Maiden series;
Elsha for Disavowals and other stories in that series (posted on Sugarquill dot net)
GreenGecko, especially for Resonance, Revolution, Resolution (posted here; other works posted on owltauri dot org)
Jocelyn for Harry Potter and the Battle of Wills, Dumbledore's Men and other stories;
Julia 32 for Scattered and other stories (posted on fictionalley dot org)
LavenderBrown for The Book of Morgan le Fey and The Final Reckoning;
Lori for The Paradigm of Uncertainty trilogy, unfortunately unfinished (posted on fictionalley dot org)
St Margarets for too many great fics to name, though my personal favorite is "Wallpapering" (posted on phoenixsong dot net and SIYE)