Lauren Ornelas, is the Director of Viva!USA , campaigning on behalf of animals killed for food. The organization does  investigations of factory farms and produces campaign materials for students and activists,. She inspired and educated Mackey and helped  instigate the changes happening at Wholefoods.
http://www.vivausa.org/

Paul Shapiro is a spokesman for Compassion Over Killing (COK,), a nonprofit animal advocacy organization based in Washington, D.C.  COK primarily focuses on cruelty to animals in agriculture, and promotes vegetarian eating as a way to build a kinder world for humans and nonhumans.
http://www.cok.net
http://www.eggscam.com