Greg is a leading expert on Peru and sustainable travel. He's written about Peru's offbeat destinations for publications around the world, including Lonely Planet, the Fodor's Guide, and other leading newspapers and periodicals. When he's not finding new routes through the backroads of the Cordilleras, Greg lives in Denver, Colorado. He's also the author of Martha, a children's book that helps kids explore history, environmentalism, and conservation. For his day job, Greg works on climate change and sustainable development for the United Nations. Follow Greg on Instagram.