As the former director of photography for National Geographic, David Griffin has worked with some of the most powerful photographs the world has ever seen. http://www.ted.com/speakers/david_griffin.htmlIn a continuation of conversations with former National Geographic Director of Photography, David Griffin shares his tips for showing work to editors. http://thephotosociety.org/blog/david-griffin-what-it-takes/ Erik Johansson creates realistic photos of impossible scenes -- capturing ideas, not moments. In this witty how-to, the Photoshop wizard describes the principles he uses to make these fantastical scenarios come to life, while keeping them visually plausible. http://www.ted.com/talks/erik_johansson_impossible_photography.html TED has some of the most interesting talks you’ll find on the web, with topics ranging from how diet can prevent cancer to demonstrations of amazing new photo technology. They also have a great collection of talks by photographers, and we’ve compiled a list of 14 of them here. These short talks are eye-opening, jaw-dropping, and often quite moving. http://www.petapixel.com/2010/05/20/14-powerful-ted-talks-by-photographers/ Paul Nicklen uses his camera to reveal the nature of a world melting away under human-induced global warming. http://paulnicklen.com/