Mary Risley, founder of San Francisco based Food Runners , talks about the grassroots organization that provides 15,000 meals every week to low income and homeless citizens. Every week, more than 200 volunteers pick up leftover food from hotels such as the Hilton San Francisco Union Square , Westin St. Francis, and Park Central, grocery stores, Starbucks, tech and law firms, schools, bakeries, restaurants, caterers, and more.