'''Gavin de Becker''' wrote ''The Gift of Fear'', a book about security strategies for dealing with stalkers, assassins, and other forms of civil violence. <ref>Gavin de Becker is widely regarded as our nation's leading expert on the prediction and management of violence. [https://www.gavindebecker.com/bios-gavin_de_becker.cfm] </ref> <ref>He developed Mosaic — a threat assessment tool used by the Supreme Court as well as police departments and schools across the country — to predict whether someone will turn violent. [http://www.csoonline.com/read/070104/becker.html ] </ref>