I am assuming that, like another photo of MBW at this place on the Chrysler Building, this picture of on the Chrysler Building was taken by her dark room assistant Oscar Graubner. [sh] (https://iconicphotos.wordpress.com/tag/margaret-bourke-white/). However, it could also have been taken by Henri Cartier-Bresson (http://curiator.com/art/henri-cartier-bresson/margaret-bourke-white-perched-atop-the-chrysler-building-photographing)