I only have experience with Breck instructors in recent years, so unless you want an article on Breck instructors specifically ... but here are some of my favorites:
Jenn Losch. Fun, inspirational, will give you a kick in the butt when you need it. I don't know any other female instructors who huck and rip like she does.
Matt Belleville - You will not find his top end. Great instructor. Quiet, with occasional spot-on feedback.
JJ Hyon - Rips, loves to have fun, different perspective on life and skiing.
Kevin Handley - Fantastic bump skier who seems to specialize in pushing level 6-8 students just past their comfort zone. He certainly was primarily responsible for my journey from level 6 to level 8.
Patrick Guilbert - Great tips and finds the best snow on the mountain.
Carl "Yogi" Richter - follow him in the bumps and trees, and be amazed at how he slithers through them like there's nothing there.
Randy Brooks - Excellent tightly focused drills and detailed explanations for those who really want to understand and develop body mechanics
I know there are lots more that are great, but these are the ones I've skied with recently. I'm sure I'm forgetting someone important.
It occurs to me that all my favorite instructors love to ski. I mean, they always look like they are having fun. That is *so* important to me.