Check out LensFlare35.com for a great interview and narrated slideshow with humanitarian photographer Karl Grobl. He discusses how he started out, his experiences traveling and working in developing countries, and the stories behind some of his favorite photos.
Sorry, the webpage with the interview seems to be gone. Here are some other interviews with Karl:
Solola Market, Guatemala photo by dojoklo
190mm, f/4, subject distance 10m (image cropped)
For related posts, check out other entries in the Humanitarian Photography category.