How this former photojournalist went from shooting the dark side of humanity to capturing the radiance of the world's wildlife.
How about: John Isaac spent two decades as chief photographer for the United Nations, documenting some of the world's most horrific events:
Refugees from the Rwandan genocide who have died from cholera are trucked away for burning, in Zaire, 1994.
An orphaned child with AIDS peers through a door at a UNICEF shelter in Windhoek, Namibia, 2002.
Rwandan refugee children scrape a barrel for food, 1994, from one of Isaac's "saddest assignments."