As an 18-year-old, Leifer helped the disabled at Yankee Stadium, before photographing the sporting events.
The 2015 National Geographic Photo contest is back and the early entries are simply stunning.
Try not to get dizzy when you look at these images.
Celebrating the release of Andy Warhol: Polaroids by TASCHEN we take a look at a few rare portraits taken throughout his life.
All images remain property of their original owners. Site & code © 2016