MATT KAPP is the author of the new book A Century Downtown: A Visual History of Lower Manhattan (powerHouse) and has written frequently for vanityfair.com on a range of subjects from health-care industry profiteering to dating apps. He has also been a contributor to Downtown magazine and written proposals, treatments, narration, and web content for documentaries and series for Showtime, HBO, and PBS. Links to all of his Vanity Fair stories can be found here.