Oprah's Inspiring Fourth-grade Teacher, Mary Duncan

As Oprah winds down 25 years, she recalls her inspiring moments:

One of the defining moments of my life came in fourth grade—the year I was a student in Mrs. Duncan's class at Wharton Elementary School in Nashville. For the first time, I wasn't afraid to be smart, and she often stayed after school to work with me. I thought I would one day become a fourth-grade teacher.
http://www.oprah.com/oprahshow/Oprahs-Top-20-Moments/3

Reunion: Oprah's Favorite Teacher was on the Show - Includes Video http://www.oprah.com/oprahshow/10-Memorable-Oprah-Show-Reunions/2