His first book will showcase his singular vision of New York City. He flies, climbs, and spelunks all over the city, and the end result is thrilling: nighttime cityscape aerials, subway tunnels, basketball courts under the shadows of bridges, Coney Island during a blizzard, and so many others. Known professionally as 13th Witness, this born-and-raised New Yorker has amassed more than 700,000 followers on Instagram, where he posts intimate portraits,...