Keep tapes from answering machines that might include threatening or inappropriate messages. Keep any letters, notes, e-mails or any other writing sent to you. Install solid core doors with dead bolt locks. Change the keys to all of your locks and account for all keys. Make sure that all windows can be secured and locked.
Lights offer security.
Install adequate outside lighting. If you live in an apartment or University Housing, address this issue with the management. Use an unlisted telephone number. Be selective in giving out your phone number. Provide them with phones or descriptions of the offender and his car.