S.E. Hinton attended Will Rogers High School in Tulsa, Oklahoma.
I never realized until you asked this question that the book The Outsiders is based on S.E. Hinton’s high school experience! She actually wrote the book while she was in high school, because she was not happy with the idealistic books aimed at teens her age. The book was published right as she graduated high school!
Hinton was born in 1950, so she went to high school in the mid- to late sixties, and observed class-based gangs in her school. These gangs were actually called the Socs and Greasers. She wanted to write the book from the Greasers’ point of view because they were the underdogs, being from the working class and regular targets of discrimination.