Insular world of prep school gets very public, Scholars back a N.Y. teacher who lost his position after writing a satirical novel. June 11, 2007, Copyright 2006 Los Angeles Times By Erika Hayasaki, Times Staff Writer, erika.hayasaki@latimes.com NEW YORK — A teacher at an elite prep school here followed the adage "write what you know" in his satirical first novel, but his superiors were apparently uncomfortable with parallels between events in the book and life at the school. But staff members said they believed Trees was unfairly pushed out.