15% of them are chronically homeless. they live with serious medical conditions, heart disease, diabetes, mental illness. our next hero seeks these men and women out to bring them care in pittsburgh, pennsylvania. to tell us about his remarkable work is a proud supporter of direct relief which provides essential services for people in need and disasters as well as support of the trevor project, he's the star of the upcoming film "snowden", please welcome, zachary quinto. >> do i matter. when it's 10 degrees outside, the wind's blowing, and all you've got is a cardboard box in an alley, you're thinking, do i matter at all to the people passing me by. every day in my hometown, dr. jim withers makes sure they know the answer. 23 years ago, he rubbed dirt in his hair, muddled up his clothes