Rosanne Haggerty is the president and founder of Common Ground, a pioneer in the development of supportive housing and other research-based practices that end homelessness. Ms. Haggerty is a MacArthur Foundation Fellow, an Ashoka Senior Fellow, and a Hunt Alternatives Fund Prime Mover. Her organization has helped more than 4,000 people overcome homelessness, and its Street to Home program, which reduced street homelessness by 87 percent in the Times Square neighborhood over a period of two years, has been replicated in communities across the globe. Common Ground has received The Rudy Bruner Award for Urban Excellence, the Peter Drucker Award for Non-Profit Innovation, and the World Habitat Award through the United Nations and Building and Social Housing Foundation.