There are only a handful of people who've won four Pulitzer Prizes. One of them is photo-journalist Carol Guzy. She has spent most of her life using her compassionate and creative eye to document the stories of people affected by violence, war and disaster in places such as Haiti, Kosovo, Sierra Leone, Syria and Iraq.  But she's paid a steep personal price for doing her work. In this revealing episode, she talks candidly about the PTSD, depression and lung damage that she struggles with. She describes why it's all been worth it, and tells the stories behind some of her most iconic images.