Erin Gruwell, the teacher who was the inspiration behind the film "Freedom Writers," will be the guest speaker for Tennessee Tech University's Center Stage program next Wednesday, Sept. 29. Gruwell, a New York Times bestselling author, is known for her "unteachable" class in Long Beach, Calif., where she gave students a second chance through The Freedom Writers Diary. By having the students write in their own weekly diaries, she brought the divided classroom in Woodrow Wilson High School's Room 203 together through their stories of hard times. The event at TTU includes a question-and-answer session and a book signing followed by a catered reception. The 7 pm speech is open to the public and will be held in Derryberry Hall Auditorium. Admission is free.