Mine really isn't that glamorous considering who has been mentioned here already -- but without question it's Elisabeth Nicol.

She taught a fundimentals course in a little oddball interdisciplinary stream in my ungrad, the 2nd year mechanics courses and my first QM course. She was so unbelievably excited about the subject matter, a spectacular educator and had a command of the material in a way that she could communicate it to us in a way that seemed entirely intuitive when it frequently was anything but.

I teach at the undergraduate level now, and she's one of the two profs that I'm still trying to emulate twenty years later. Nevermind that i still keep a copy of her QM close by the copies of L&L..